Kyle said in one of the training that having an affiliate product in every post is not a good idea. It might harm our organic ranking.

I am into blogging niche. I was thinking of adding one or two affiliate banners in my sidebar. Is it a good idea or will it affect lower my ranking?

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ValerieJoy Premium
Having banners in your sidebar with affiliate links is different from having an affiliate link in every post.

However, I suggest you promote no more than 2 affiliate products in your sidebar. Something to be aware of is that banners are not frequently clicked on.
JaneMahlehle Premium
I don’t think it can do any harm if you put one
SnazzyIT Premium
It depends, I have included a side menu widget to show my most recommended programs - in cloaked links to the names of those programs. That has never hindered my rankings.