I’m a really talented Artist…I draw stuff like anime a lot but I have no idea how to make a art portfolio!
Remember - google is your friend.
In the meanwhile, here’s a link to the portfolio guidelines and requirements for cartooning at SVA, since you’ve already created another thread asking if this requirement is really a requirement.
Short answer, yes it is:
http://www.sva.edu/attend-sva/undergraduate/portfolio-guidelines
Any reputable art school will require a portfolio, even if it’s just to see what you don’t know.
Rather than be frightened off by the portfolio, embrace it. It is the vehicle that you can use to show,
and simply not tell them, how talented of an artist you really are.