For example the share to "Everybody" confounds most. "Everybody" is defined as "accounts on this PC." This got worse with the email login on W10. So to get this working you may enable the Guest account (how, what is on google searches.)
And you never dismiss logging onto the remote computer locally with the account you use on your other PC. I find this step to be missing most of the time and folk new to Windows networking ignoring this step.
I enabled everything i knew and i see the two hard drives on a remote computer on my simple home network, with simple file sharing, but i am told i have no permission and can't access them.
There is no password on the remote and it just refused, with a hard sound, it didn't ask for a password