Neta means things, goods.
【Era】 Edo Times~
【Type】 Reverse expression
Neta in Japanese means the "goods to survive". It is the reverse of "rice seeds" (米の種). Seeds in Japanese is "tane", and the reverse of it is "neta". There are other reverse expression in Japanese such as "moku"（もく） meaning tobacco in the edo times (because smoke from tobacco is like clouds- kumo). Personally, I don't really understand the reverse expression thing, but I guess it is kinda fun and confusing?
So neta is the livelihood of every profession, such as rice is to rice stores, fish to sushi, punch line to comedians, and evidence to police.
Moto neta（元ネタ） is something like "the origin of the neta". In this blog, I will try to theorize and speculate the many netas in the ACG world (anime, comics and games), so its just useless information...