Have a ssh-key here c:/Users/User1/.ssh/github_rsa. I added it to ssh-agent using commands
eval $(ssh-agent -s)
ssh-add ~/.ssh/githab_rsa
After rebooting PC ssh agent does not see my ssh key. I have to add it once more using commands
eval $(ssh-agent -s)
ssh-add ~/.ssh/githab_rsa
How to urge ssh-agent to remember my ssh key on PC.