Should the logo be clickable?

Should the logo be clickable on the main page of the portal?

Definitely - YES.

Why? The answer is simple - many non-advanced users click on the logo, even if they are on the main page, to refresh the page. And to make sure they are on the main page.
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If you do not believe, put them behind your site and get them to work with it for a while, you will see.

So - if you can’t click on the logo on the main one, they first fall into a stupor (how is that?). And only then it comes to them - that this is the main page, so it does not click. And this is the wrong way.

You know, even I, referring to myself as an advanced Internet user, noticed that sometimes I use a click on a logo to simply refresh the page (closer to dragging the mouse to it). And do not connect your left hand.

Therefore, respect to the developers of Habr, and non-respect to the developers of Yandex.