As others have said I would 100% recommended the Mass Effect trilogy.
I Also really enjoyed the crysis trilogy, it’s like playing through a Michael Bay alien movie. The 2nd and 3rd games especially.
I’d also recommend the Arkham and Witcher trilogies. For the Witcher trilogy I’d wait till the remake of the first game comes out if you plan on playing them in order, as the first game hasn’t aged particularly well.
I like Reborn OS. It’s like Manjaro but more user customisable.