So, I am confused about address/key length. I am aware that the length is 16-36 characters, but it seems that many people online when giving their public key use a short-form of 7 characters (being only a part of the full address) to receive coins. Also when I was first looking into Bitcoin I read something in a tutorial that mentioned this 7 character short form but I can no longer find said tutorial (was a page similar to bitcoin.com and coindesk). Does this even exist?
I think what you are mentionning is firstbits. But this practice is now obsolete as it encourages address reuse, which reduces privacy.