Web site for Banknotes?

OK, I know it's been asked before, but I'll ask again. What is the best web site to list and swap banknotes. Most I looked at seem a little to complicated for this old man. Are there any like this one easy to use? I'm kind of stuck on my coins. The ones I have to swap, seems everyone has. So want to do a little in the banknote area. Thanks for any advice.

See here:https://colnect.com/en/banknotes

Verweis : "coinmaniacbg"​See here:https://colnect.com/en/banknotes

​Thanks, I sort of looked at that already. Looked kind of complicated for an old man. I'll look more closely and see. Thanks.