How to write a commit message

[X, Ticketnumber] Commit message

X : commit type, x ∈ ...
F : Feature
B : BugFix
R : Refactoring (almost) no functional change
M : Meta Version Bumb, Release, Docs
G : Graphics
L : Libraries
T : Tests
Y : Merge Changes
S : CodeStyle without functional effect (e.g. adding comments)
D : Documentation (e.g. upadated README.md)
PR : Changes in project settings
GT : Commits that do not include any code but rather changes to fix something in git