Having problems with wp-cron

All started as i tried to schedule a post for the future and it never got posted.

i did a bit of research and found out that wp-cron shouuld be the problem.

i have already disabled wp cron in wp-config.php

and i was googling what the right syntax is for adding a cron job to my server

i am running a root server with full access but with googling pretty much evry tutorial tells me something different.

do i have to use wget to call wp-cron.php or wp-cron.php?doing-wp-cron

for wget can i use the filesystem structure on my server or do i have to use a domain?

can i use /var/www/mysite/wp-cron.php or do i have to use https://www.mysite.com/wp-cron.php?

next question is:

the time i set in wordpress when the post should be published. This would be server time or?