Git checkout command is used to switch between different branches and to update the files in the working directory to match the versions stored in a specific branch or commit.

Here’s an example:

Suppose you are working on a branch called “feature-branch”, and you want to switch to the main branch. You can use the following command:

git checkout main

This command will switch you to the main branch. Now, let’s say you need to work on a specific commit in that branch. You can use the commit hash or ID to check out that version as follows:

git checkout 87a3cde

Here, 87a3cde is the commit ID you want to check out.

I hope that helps!