Ubuntu is the common bistro that everyone gets started on. Lots of advanced users continue to use it, because it works well.
Use Ubuntu or Mint or Pop_OS (both of which are modified varieties of Ubuntu). Watch some Youtube videos to compare them. Pop_OS is supposed to be particularly good for gaming, but I’m not sure why
It has always been a very common term to describe the distro/OS of choice. Even moreso when linux was a bit less usable as a desktop OS and dual-booting was pretty necessary