I have a many favorite websites, but out of all of them I use Nexus Mods the most. I have quite a wide variety of sites that I visit on a daily basis. I check my followed content and look for new content. I try not to spend too much time of the Nexus, but it's so hard not to check out the cool things people are creating.
I like this site because of the availability to game mods it provides. Be it for Xcom 2, Skyrim, or Fallout 4 Nexus Mods is a one stop shop for modding needs. I could get mods from elswhere, but the Nexus is the most known moding community. I like it because everyone knows about it and it's almost certain someone has made what you are looking for. If not, then the community there is kind enough to help you make it yourself.
One great part about the website is it's accessibility. It uses various dropdowns, sections, and lists to help you find what you want in a timely maner. One thing I would change is an obnoxious ad that is fixed on screen. Not only does it stay on the bottom right of the screen as you school, but it also lacks controls to pause and mute.