For advanced git commands training

You can make any training in test branch

git reset

To make a commit you need to do 3 steps:

1. Make changes
2. Add them to staging area
3. Make a commit

git reset --soft      # resets #3 only
git reset (--mixed)   # resets #3 and #2
git reset --hard      # resets all #3, #2 and #1

---

git rebase

git rebase <hash>     # rebase using commits's hash
git rebase -i HEAD~n  # interactive rebase for last n commits 

---

git commit referencing using ^ and ~

~n      # follows straight history in one branch
^ = ^1  # first parent
^n      # n parent
^^^2    # first parent/first parent/second parent

To practice referencing checkout "merge" branch and use some command to see what commints are referenced.

git log --oneline -1 HEAD~4
git log --oneline -1 HEAD~4^2^
etc...