It's really hard to say there's a "best".

There really are a lot of resources, some are free, some are relatively cheap, and some cost money.

code school
udacity
tree house
code avengers
udemy
codecademy
codermania
launch school
bloc
thinkful

But it really depends on what you want to learn.

There are also smaller not well known places that give a lot of 1-1 attention as long as you're willing to put in the time and effort.