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Git push requires username and password

I cloned a Git repository from my GitHub account to my PC.

I want to work with both my PC and laptop, but with one GitHub account.

When I try to push to or pull from GitHub using my PC, it requires a username and password, but not when I'm using the laptop!

I don't want to type my username and password every time I interact with origin. What am I missing here?

Answer*

List your current SSH keys:

 ls -l ~/.ssh

Generate a new SSH key:

 ssh-keygen -t ed25519 -C "your_email@example.com"

where you should replace `your_email@example.com` with your GitHub email
 address. 
When prompted to `Enter a file in which to save the key`, press
 <kbd>Enter</kbd>. 
Upon `Enter passphrase (empty for no passphrase)` - just press
 <kbd>Enter</kbd> (for an empty passphrase). 
List the your SSH keys again:

 ls -l ~/.ssh

The files `id_ed25519` and `id_ed25519.pub` should now have been added. 
Start the ssh-agent in the background:

 eval $(ssh-agent -s)

Add your SSH private key to the ssh-agent:

 ssh-add ~/.ssh/id_ed25519

Next output the public key to the terminal screen:

 cat ~/.ssh/id_ed25519.pub

Copy the output to the clipboard
 (<kbd>Ctrl</kbd> + <kbd>Insert</kbd>). 
Go to `https://github.com/<your-github-username>` and sign in with your
 username and password. 
Click your GitHub avatar in the upper-right corner, and then **Settings**.
In the left pane click **SSH and GPG keys**.
 Click the green-colored button **New SSH key**
 and paste the public SSH key into the textarea labeled **Key**.
Use a descriptive **Title** that tells from what computer you will
 use this SSH key. Click **Add SSH key**.
<hr/>

If your current local repository was created with **http** and **username**,
 it needs to be recreated it so as to become SSH compatible. 
First check to make sure that you have a clean working tree
 so that you don't lose any work:

 git status

Then `cd ..` to the parent directory and `rm -fr <name-of-your-repo>`. 
Finally clone a fresh copy that uses SSH instead of username/password:

 git clone git@github.com:[your-github-username]/[repository-name].git

References: 
https://docs.github.com/en/free-pro-team@latest/github/authenticating-to-github/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent 
https://docs.github.com/en/free-pro-team@latest/github/authenticating-to-github/adding-a-new-ssh-key-to-your-github-account

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Git push requires username and password

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