[quote=@Gareth]
When is it good to collab and when not?  [/quote]

I don't like them. I suppose they're preferable when you're writing about something that only involves 1 other person and is of no interest to anyone else.

[quote=@Gareth]Are time skips a thing in roleplays or no?[/quote]

Yes.

[quote=@Gareth]Are there roleplays where it's good to list where you are, the time of day and perhaps the name of your character at the top?[/quote]

Yes.

[quote=@Gareth]Are Headings for roleplay posts important?[/quote]

No.

[quote=@Gareth]Are different colors for players posts a good thing or bad?[/quote]

A good writer doesn't need a different color to distinguish between who is talking and who isn't.