How to see the previous commit without deleting the current one?

Question

git

Hello!
Created commit One, made changes, created commit Two.
git log shows two commits ( One and Two)

Task: I want to see the status of the project on commit One and then return to commit Two (current, last)
1. I type the command git checkout + commit hash One
2. I see changes in the html file as was at the beginning (commit One), i.e. everything OK - I looked, I'm satisfied-)
3. I run git log - I see only one commit number One.

Q:
Why was commit Two removed?
How to look at the past states of the project and then return to the current state of the project (last commit)?

Thanks).

Answer 1

He didn't leave. Read the Git Book to understand what each command does
. You have moved the HEAD pointer to a specific commit. Now go ahead git checkout master(if the master branch is master, which is most likely) and watch both commits.

Answer 2

Colleagues, tell me more.
I noticed that if I try to roll back to the previous commit by the SHA-1
git checkout 09164b82059dbadcd75d82994e94d13eb63e210e1 ~
I get an error (the tilde character at the end he added)
git checkout 09164b82059dbadcd75d82994e94d13eb63e210e1 ~
error: pathspec '09164b82059dbadcd75d82994e94d13eb63e210e1 ~' DID not the match the any file (s) known to the git
BUT, if through git hist
git checkout e3ff6c0
then everything works
Question: does this mean that it is impossible to switch to a commit through SHA-1.
What other simple commands are there to switch to the desired commit?
Thanks).