When I was on Android, I used Markor for text editing and Termux for command line git.

For iOS, I now use Working Copy for git commit/push/pull, and Obsidian to edit text, and I like Obsidian's interface a lot for making quick Markdown edits.

I believe Obsidian has an Android version as well, but I have not used it. I'm not sure if there is an Android version for Working Copy but there may be similar GUI git apps.