A Rift Apart is a sequel to Nexus (Into The Nexus), and NOT the reboot... right? If so then I REALLY need to catch up before I play it, lol. I've not played A Crack In Time or Nexus yet.. I don't even own the latter, and buying a copy may end up being expensive :o
Yes. For all intents and purposes the reboot is a self-contained side game. I really liked it and it was a lot of fun but you can avoid/ignore it if you're iun any way caring about continuity.
I'd recommend, if you're looking to prepare yourself: Tools of Destruction, Quest for Booty, A Crack in Time, Into the Nexus. Two full games, two side games. The story there is pretty consistent and fun throughout with a lot of carrying-over story beats and characters. the original trilogy/deadlocked is kind of its own thing, the future series is its own thing, and everything else is side content. I HOPE this creates a new trilogy or series on PS5, because after seeing how fun A Crack in Time is/was...well hot damn. imagine how good looking and feeling Rift Apart will be!
I personally liked Q-force/Full FRontal Assault as well as All 4 One and the PSP games (Size Matters/Secret Agent Clank), but you can skip all of them if you want. they're fun experiments (Co-op and tower defense, both fun, neither as good as the main games).
My Console Library:
PS4, PS3, PS2, PS1, WiiU, Wii, GCN, N64 SNES, XBO, 360
3DS, DS, GBA, Vita, PSP, Android
Top 6 this generation:
Bloodborne, Sekiro: Shadows Die Twice, God of War, The Legend of Zelda: Breath of the Wild, Dark Souls III, Red Dead Redemption II, Rock Band 4