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Hi onurcan-ikiz! Moz has a great blog post that discusses how many links is too many. I would check that out for advice—while there isn't an exact number of links you should not exceed, many people suggest having fewer than 100 links per page. If you main navigation as a lot of links I would be worried about the link juice. When your website receives a backlink from another website, hopefully with a high domain authority (YAY!), the link juice is being spread out to ALL the pages being linked from the page they are linking to. This means if www.cnn.com (who has a domain authority of 96) links to your company's homepage, they would be spreading some of their authority to you through "link juice". But instead of retaining majority of that juice/authority on the homepage (thus increasing the authority on that page), you are going to be spreading fewer and fewer amounts of that authority through all 100+ pages linked from the main navigation. Check out this link juice diagram to get a visual representation of what I am talking about. Hope this helps!