Depends on the size of the project. Some informal convention can be pretty helpful when a personal projects gets sufficiently large, to the point where you may at some point have to look at the git log.
If you're building the next open source self-hosted facebook, yeah I think a convention is necessary. However, if you're building "my calculator app in Rust" then you're probably okay just doing commits "abcd123" just so that you can have remote code storage :^)