Glad I came across this thread. This is good to know.I agree: Linux Mint (with either desktop choice). I use Mint with Mate myself.
As @arochester noted above, Linux Lite is also a very nice Ubuntu-based distro as well. However, if you have a UEFI-based motherboard, you would need to change some settings to make it work (disable Secure Boot and enable CSM or Legacy Mode). With Mint or Ubuntu you should not need to modify those settings.
I want to become a poweruser in Linux, so, what I should do to become that?
I'm also very interested to learn the Linux Terminal completely (in an Advanced level), so, please guide me in this also.