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Hi,

I am about to start writing blog posts as part of my SEO strategy. 
I was thinking to create a subdomain on my current website and install Wordpress but I am wondering is there a benefit of using another platform such as Medium for blogging.
I am just wondering if posting on Medium ranks me higher on Google as it has a higher domain authority?

Also, if I use Medium for blogging and add links to my website then those would be seen as positive backlinks by Google,
Any thoughts on this?

I read the recommended title length is 50-60 characters depending on alphabets, etc,.
Anyways, my question is, is there any harm of having longer title?
If all my important keywords are within the 50-60 characters that will show up on search results, I can still make the title longer, it's just that those keywords outside won't have any effect on search results?

I have noticed Google image search has included suggestion tabs (e.g,. design, nature... when searching background) on the top of the image search.
Are there specific meta tags I can add into my images so that my images will show up on each tab?
Do those filters just show content based on image keywords or something else?

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