Please does the universal certificate auto renew for free? Or i have to manually go over it again. secondly, do i need the origin certificate too?And do i need both edge and origin certificate because previously i use origin certificate on my server and everything works fine for me.
The universal certificate auto-renews. You don’t need to worry about it.
Yes, you also need an origin certificate. The way it works is that there is a connection from the browser to Cloudflare, which uses the edge certificate; and a connection from Cloudflare to you, which uses the origin certificate.
If you already have a certificate on your server and it’s working fine (as you indicated) then you’re in good shape. You’ll need to renew that origin certificate also, which can be made automatic if you’re using Let’s Encrypt.