Why do stage?

Question

git

Why do stage, then commit, if you can make a commit without it.

Answer 1

Can you tell me how you commit files if you don't tell git to commit them?

https://git-scm.com/book/en/v2

Answer 2

There are files in the workspace - just lying in the directory
. There are files in the stage prepared for commit.
git commit: Commits exactly what is in the stage, not what is in the directory.
git commit -a: Automatically adds all tracked files to stage and commits. But for example, a freshly added file that has not yet been in the git will not be included in the commit.
for example

echo "hello" > a.txt
git commit -m "add a.txt"

nothing will be committed,
but like this - it will be committed

echo "hello" > a.txt
git add a.txt
git commit -m "add a.txt"