How to watch Jojo
Avoid "Jojo's Bizarre Adventure" and "Jojo's Bizarre Adventure (2000)" they are OVA's - I recommend just checking them out AFTER watching the main series
In order:
Jojo's Bizarre Adventure (2012) - this covers Part's 1 and 2 (26 episodes)
Jojo's Bizarre Adventure: Stardust Crusaders - Covers the first half of part 3 (24 Episodes)
Jojo's Bizarre Adventure: Stardust Crusaders 2nd Season - Covers the second half of part 3 (24 Episodes [48 total episodes for stardust crusaders])
Jojo's Bizarre Adventure: Diamond is Unbreakable - Covers Part 4 (39 Episodes)
And finally
Jojo's Bizarre Adventure: Golden Wind - Covers part 5 and is still being aired. (Supposed to be 39 Episodes, currently as of writing this - 18, releasing every Friday)
@Isuckatgaming part 6 never