There are so many you can join without a website Google could actually help with that can't mention any programs here but you can search here on BHW for many you can promote without the need for a website.
You should look out for those affiliate programs which allow you to promote affiliate links on social media, forums, and other marketing platforms. There are many affiliate programs that don't require a website and their commission rates are also very good. I would suggest you to check AccuWeb Hosting if you are interested in the web hosting niche.
You can find some networks that will accept it, but be aware that they are probably some lower-rate sites. If you want to be successful in the affiliate marketing industry you should invest in websites. Most advertisers want to place their offers on reliable pages that have a decent amount of monthly traffic. This way, as you don't have the site it will be hard to prove your value unless you have some social network profile with bunch of followers.
that's too easy, usually
