Naming Convention
Of course Naming Convention on assets still subjective to each.
But if have some doubt about some asset naming you can look at this github repository
It remains a good way to start and prepare your landmark
Versionning
Basically you can use Git or Perforce as a Versionning Tool in Unreal Engine
It's very important when you create a project especially for backup or rollback
And more for team work I would say it’s almost essential.
Of course when it's the first time you use it or still learning, It will take you a long time to learn and assimilate it
So maybe it's better to learn it on a project test or small project before making critical manipulations on a too much important project
Sementic
About version number on a game (like 0.2.1), you can read this semver.org
A very great resource about how you should number your project versions