Are affiliate sites still profitable?

I’ve been looking at other ways to make money, and having an affiliate site seems to be something I would like to add to my side hustle.

I have come up with a great idea (I believe), however, before I go all in, I would like to get some suggestions/advice/criticism on starting a site.

What are some of the best sites you have seen?

I plan on going the Amazon route, as this is what most products will be sold on.

Any tips on starting out would be great!

Cheers!

SEO Reports??

What is the best program to use for offline clients? Im currently using SEO powersuite but i think its to detailed for clients. Anyone know of any better and client friendly software i can use. Thanks