Thing is, someone who is obviously not proficient at TCP/IP programming has ... pretty much zero shot at building a reasonably good netcode solution for an MMO from scratch.
Or at least not in a reasonable time span. So much stuff to learn before even starting.
Existing engines such as Unity or UE offer a degree of abstraction from that concern which may allow the OP to build something that actually works to an extent (before he realizes it will take him many, many years to ship something usable
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