Wait ... you lost me there , there's no tutorial on how to make TERRARIA because that would be a colossal and complicated task , as you need to make the terrain algorithm , lighting algorithm , crafting , blocks , bosses , etc.
and that's EXTREMELY OVERAMBITIOUS for a starter with the software , I recommend you familiarize with the C2 before tackling such a big project , and even there , it would be extremely overcomplicated
That's one of the reasons why terraria sells for $$$
Cheers !