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There are tools, maybe without notification, maybe with. But they are often times not 100% accurate. To be accurate you should check GSC external Links. Tools show you thinks often times late or links google don't knows (maybe). Think ahrefs, semrush or even moz linkexplorer is checking links including new and gone links. You can include GSC Links in semrush - so the basis are accurate.  Bet thats the same for some other tools, but I only know it for sure in semrush. You can get a report from semrush so it maybe fits your needs.

Sorry I have to check if I can find screenshots of it, but it was just an image right bottom linking to a subdomain, looking like a chat..

First - I never did that. My footers are pretty clean, sometimes links for users in it with easy-to-find content most of them wants to go. But in a lot of cases, there is faceted nav in sidebars. Where is the difference from a mobile-first point of view. Kill the footer and your sidebar is the footer

There are points you can do wrong with faceted nav - doesn't matter where it is. Think here you can find some stuff: https://moz.com/blog/large-site-seo-basics-faceted-navigation

By the way "top navigation cant be touched" is not true. But when it works perfectly you wont touch it. Until it is not, I touch it several times. If there is room for improvement you should do. But yes, it could have huge effects, so you need to be sure about what you are doing.

Depends on chat but in a lot cases - it is true . We added a chat-icon on the bottom right side and via click you have been sent to a page where you could chat. But a lot of functionality is lost.  Something like chat is popping up and starts communication. AMP is somehow find solutions for stupid problems you never thought about... At least, better as no chat at all. Maybe that option is good enaugh for your client.

Do you wanted to ping google? I mean ....  I can read you ask if it is ok to spent 200$ for a followed link? Or is it nofollow, no problemo in this case.

rel attributes like noopener or noreferrer arent used in search, even if he was asked for noopener nofollow, it is the same with followed links

here: https://twitter.com/JohnMu/status/1046429955595403264

Its a redirect from non trailing-slash to trailing-slash version of the page, which ends up in a broken 404-Page.

Remove all internal Links to the Dealers/Downloads page. That should solve the Problems from an SEO POV. But why the 404-Page is broken? Think it is  the breadcrumb, shouldn't came up if all linked Pages exist. Funny is - I don't saw breadcrumbs anywhere.

BTW - on my Laptop it is impossible to use the menu.  The basket Icon is in the second line of your menu, makes it impossible to click on a sub-link in the menu.

at least, how fast google is indexing your domain depends on your structure (and more). I read a few weeks ago something about an "indexing race" just to se wich way is the fastest to get your pages indexed (https://searchengineland.com/ready-set-go-googlebot-race-314894). Funny because not my preffered solution won.

It depends on google if it would index every page  of a domain - for your given example I think Google will not. Several products in different colors (and thats the only difference) on different urls. Not sure if there was the difference (the color) mentioned anywhere, or if it is just a different image (not my language).  Thats not best practice.

You have to deal with your crawl-budget for 1-2 million pages, but at the moment I think - all you can do is wait. And I saw a lot more pages indexed  (460,000) - but somewhere in serps google stops showing me your pages, because they are to equal to others. I think (what I saw) there are a lot of Products without any single description, so you can do a lot of things to improve, until you wait.

Think that doesn't matter to much (if your domain is branded). At least I prefer a branded anchor, easier to click and when you change the domain (for whatever reason) the guy who clicks is not wondering to much when he gets redirected to a different domain.

My links on P0 are allways cutted, at least I have some links in the content, seems that it doesn't matter or wont hurt you. For the optimization: Izzy Smith did a pretty useful presentation (https://tech-seo.de/wp-content/uploads/2017/08/Practical-Insights-into-Winning-Rich-and-Featured-Snippets.pdf) and at MOZ of course there are a lot of things about that topic - i love this one: https://moz.com/blog/what-we-learned-analyzing-featured-snippets.

Idk what you mean with Keywordlimit, but maybe the two blue Links will answer your question. Optimization for P0 is less Keyword-thinking, more about get the User Intent and answer the questions.

I was wondering about site/ brand-names added to the title by google to, than I realized that Google is only doing this brandname at the end (and truncated titles to display the brandname completely) for searches that are also including the site or brand name. The same search without the site/brand name shows the usual title tag.

Maybe you should check that.

I head a lot of clients with errors like this, it never caused google not to rank the content...

even seomoz.org is shown when you search it with site-parameter.
No error as long as it is not shown for search queries

1. Disavow should be the last step - i prefer to contact webmasters first. But if you need to disavow, be carefull and do not disavow helpful links.

If you disavow Backlinks and earn new, surely they will be counted.

You can disavow a page, a domain or a subdomain - i bet also directories. If you have disavowed a domain and you get links from that domain, they will not be counted. So better you don't disavow the complete wordpress domain including all subdomains

ITS Not about loss of Linkjuice. ITS Not cool to Link sitewide in Footer to other Domains and link Back.

My best practice: is the Link clicked by Users .. helpfull 4 Them: nofollow. Is the Link Not clicked or Not helpfull, Just exists to have links: delete

The Page is Not Ranking in mobile searched from Berlin. Didnt checked in Tools.

The subpage is Not optimized to Rank for that querry, the Homepage Not much better. The Footer is more than critical. Extern Links to other Projects sitewide. If those Link Back U have a Problem with links.

I think your focus in General is to much da,Pa,Link based. You have a Lot of Things To-Do onpage. But Clean your footers fast. Than get an SEO tactic wich is Not so much Link based. You dont have a great answer for hotel Bremen. Just to be a hotel in Bremen is Not enaugh.

Goto HRS, booking, TripAdvisor,aso (guess U are). And do local SEO. Should be a quicker win. Search for Hotel Bremen and Look to These few Hotels Google Shows. Give a better answer. Looks a bit Like to old school SEO at the Moment.

Greetings from Berlin and sorry ... German autocorrection

Imo internal Link-structure could help or be a problem, but its hard to say, maybe These Pages are Ranking exactly where they should rank. May be its not necessary to have These categories or they cannibalize, hard to say without Note Info.

Responsible for the Content in These iframes would be the Subdomain. For Google, delivering that Content in iframes is Like serving empty Pages. What you are trying is impossible. Why Not redesign in a usefull CMS, redirect if needed and ready?

There are not a lot of reasons for a better ranking root domain.  Möge dir improvement of the help content. Why did u expected a better ranking for the Rest? There was "No" change, Just some new internal links. They have been there before, nur from another URL.

Main Website lost? Thats the Strange Part, if true.

Was it a manual penalty? However - Bad Links are still something you should take care. I asked John Mueller just because I got spammy Links from chinese pages. He said if you know a problem with links, take care - google is not penguin only (penguin would "kill" the links by itselfe).

So make a list with bad links - all the bad links and disavow them. If it was a manual action you need to make a reconsideration request for your page in GSC.

Usefull:
https://moz.com/blog/guide-to-googles-disavow-tool
https://moz.com/blog/google-disavow-tool