MemEdit, how does it work?

I don't believe there is a memedit function in any library I know of, paste the function on here.

want to ask if its still be done

Write op came from necro, and writememory is by far the most used today.

it works the same as every other game lol. memcpy will copy a pattern of bytes to the targeted address aka replace the original opcode to alter the instruction and make it do something you want it to do.
@-Bl00d- memoria is not a function i could find in the msdn

a quick way to do this would be make a function that grants u full memory access to the address you are going to modify

check for reference on the msdn

VirtualProtect
memcpy

have fun learning.