Karl Max was the founder of communism

how did it become so popular

There was actual ownership of things being ascribed to the community as a whole or to the state

why is it the best economic philosophy?

it is because it is it is a socio-economic structure that promotes the establishment of a classless, stateless society based on common ownership of the means of production.

what are the advantages of communism over the other two philosophies?

communism supports the emancipation of women and the ending of their exploitation.

communist ideology advocates universal education with a focus on developing the proletariat with knowledge.

where can we find example of this today, and how is it being followed?

China is communism. And they follow it by having very strict laws and priorities.