Linux Mint Debian Edition is very lightweight and easy to use.

Try one of the lightweight Ubuntu distros: Lubuntu or Xubuntu.

Linux mint has delivered me a consistent experience on the verge of boring (Good for an OS) with great driver support and minimal intervention. I have wandered a long path of distro hopping and can say if you want to screw around, learn linux, and have to care about maintaining it (Like a car or house) try EndeavourOS or other major distros. If you want an OS that works for you without much intervention, give mint a try.

The default Cinnamon DE is quite light, but it also comes with an even lighter XFCE version. I prefer Cinnamon because it just hits the right spot for what I knew computing to be.