when i want to import my ssh key in github i have This Erorr "Key is invalid. You must supply a key in OpenSSH public key format"

when i want to import my ssh key in github i have This Erorr "Key is invalid. You must supply a key in OpenSSH public key format"

Try again with:
ssh -P "" -t rsa -f ~/.ssh/github
cat ~/.ssh/github.pub
Copy the public key content in your GitHub SSH setting page: this one should work.
One starting with SHA256:... looks like a key fingerprint, not an actual public key.