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To completely remove the changes and come back to last commit, first get the last commit id (hash)

The full form of the hash (ID) is  :
<code bash>
git rev-parse  HEAD
</code>

The short form of the ID si :
<code bash>
git rev-parse --short HEAD
</code>
We call the ID we get, the COMMIT_ID 

A hard (strong) come back with reset to the file state at the last commit. **All the uncommitted changes we be lost** :
<code bash>
git reset --hard COMMIT_ID
</code>

A smoother way is to temporarily **stash** the uncommitted changes, and add them back after resetting to last commit :
<code bash>
git stash
git reset --hard COMMIT_ID
git stash pop
</code>