The best starting points are any of the following:
-Resident Evil HD Remaster: A remake of the first Resident Evil, which surpasses the original in pretty much every way for any newcomers. It's the original, very atmospheric, may take some time to get used to the fixed camera set-up, but it's a really good game with great atmosphere.
-Resident Evil 2 (either the original 1998 PS1 game, or the 2019 Remake): Both games tell a story of new character in a new situation, don't need to have played the first game to play this. The 1998 original and 2019 are really different from each other, the Remake is more a reimagining, but both are very, very good, and good starting points.
-Resident Evil 4: Really shaked up the series formula, regarded by many as one of the best games of all time, was made to be newcomer friendly and a good hopping in point for the franchise.
-Resident Evil 7: Changed the formula again to first-person, tells a pretty stand-alone story in an isolated farmhouse in Louisiana. Focused more on horror, can be played on PSVR on PS4/PS5.
Really, any of those would do and make for great entry points. Though, if you're specifically interested in RE8, starting with RE7 may be a good idea, as RE8 is a direct sequel to it.