Battletech is a great IP and my second favorite fictional universe after Star Wars. I’ve been a big fan since 1995, when I obsessively played MechWarrior 2 and realized one day in a comic store that all of the “history” in the Clan holoprojector came right out of the Wolf and Jade Falcon sourcebooks. There are several distinct eras in the setting, each with its own galactic map and technology level, and although it started as a tabletop wargame, it’s gotten several great video game spinoffs over the years, including real-time tactics (MechCommander), turn-based strategy (HBS BattleTech, which is like X-COM with giant stompy robots), silly action (MechAssault 1 and 2 on the OG XBOX) and my personal favorite, sims (like MechWarrior 2) where you pilot said robots, blow stuff up, smash buildings and infrastructure like an angry mechanized Godzilla. This 1d6chan entry is a long, but quite informative, summary of the whole enterprise:
https://1d6chan.miraheze.org/wiki/BattleTech

Unfortunately, the current IP holders (Catalyst Game Labs) are hellbent on burning down the IP as quickly as possible. There have been several controversies this decade, but the most recent one involves a classic infiltration by an SJW community manager, who then proceeded to mass ban every “problematic” personality in the fandom while giving a megaphone to anyone who toes the progressive line and looking the other way on their actual antisocial behavior. The wiki (Sarna.net) is completely converged, and certain authors who publish canon fiction love dragging Current Year political and social issues into a setting where it makes absolutely no sense to include them.

Lord Raz0r of the Fist Clan himself is a diehard BattleTech fan, and here admonishes us to enjoy the franchise without giving one red cent to the a-holes at CGL:
https://youtu.be/z86sIScsZqQ?si=OcBO5roqfA2-RCt_

I personally recommend HBS BattleTech. Despite being a heavily simplified version of the tabletop game and some very mild silliness with pronouns up front, it’s an awesome game. I love having to play Space Accountant and having to make payroll every month, and decide which missions to take on the basis of “will I actually be able to make a profit on this if it goes sideways and my mechs and pilots get all tore up?”
https://store.steampowered.com/app/637090/BATTLETECH/

They also just released MW5: Clans this year, which I have not played but which the fandom has responded very positively to:
https://store.steampowered.com/app/2000890/MechWarrior_5_Clans/

Tex of the Black Pants Legion also releases a few insanely detailed videos per year on either a particular model of BattleMech or inflection points in BattleTech history. They are entertaining as hell even if you know nothing about the setting.
https://www.youtube.com/watch?v=Fa1rfZsKfa0&list=PLR5zhFCFVb9XC9FtMuHzgdcl0WvfsQdC0

Enjoy, and remember – KILL THE MEAT, SAVE THE METAL!