03. git commit --fixup / --squash — 3/4

Using fixup and squash commits to correct typos, fixing errors, updating commit titles/messages, bugs etc.

I'm also using few flags that are not the scope of this project but just to list them:
- git commit -v
- git log -p
- git diff --cached
- git rebase -i [main branch]
- git rebase -i --no-autosquash [main branch]
- git rebase -i --autosquash [main branch]