We’ve been using GIT for quite some time. To really be useful though, you either need to export to text each app as a TXA or use Rick Martins clarion addin. Apps are binary, so there usefulness in a repo is limited. Using the addin adds a menu item to the toolbar to export each module separately as a text file. This way each module can be worked on by separate developers and the results merged back together. Likewise, as text files you can see the changes that have been made along the way.
Dictionaries are more problematic. Since there is no checkout in git, we basically chat between us when a dictionary change needs to be made.
You can find the addin at Clarion Shop. There have been some Clarion Live presentations on it’s use and Rick has been a great resource to get you up and running.
Good Luck! Let us know how it goes.