Steam Community :: Guide :: DOOM Written Guide/Walkthrough for all secrets on each mission including Doomguy locations.
DOOM - How to get the BFG 9000 - Laser Trap Room Locked - YouTube
PSA: The reason movement in Doom Eternal looks slower than in 2016 is because (1) FOV is lower, (2) they don't have the Air Control rune enabled : r/Doom