Different ads for different posts

I’m in the processing of applying for affiliate marketing programs and was wondering if there is a way to put different affiliate links (on the sidebar) for every posts.

The reason I ask is that if I make a posts about checking accounts, I want the ads on the sides to be related to checking accounts or similar. If I have a post for winter products, I like the sides to have winter stuff not the checking stuff.

Thanks.

My site is https://www.thepracticalsaver.com and I’m using the fashionista theme.