1) What do you mean by fundamentals? If you've been programming for a few years you probably already have the fundamentals of programming down (variables, funct

1) What do you mean by fundamentals? If you've been programming for a few years you probably already have the fundamentals of programming down (variables, functions, callbacks, loops etc). Rather it sounds like you need to be prepped some more advanced problems that show a higher level of thinking (sorting, searching, optimizing, data structures etc). I would recommend a good algorithms book and a good data structures book. The Algorithms book you're reading sounds good. Some programmers who got the "fundamentals" in school will still pick up a book and go over those types of problems when prepping for interviews. Don't forget to practice working problems out on a whiteboard out loud. 2)Are they important? Yes and No. Will you use your knowledge ofdata structures and algorithms everyday? For most jobs the answer tends to be no. Will it help you overall be an efficient developer? Absolutely. 3) There are so many, Khan Academy and Coursera are quite good I think, give them a shot.