I replied to another user "40acres" in this thread about my process, check that out for additional details. Yes, watch videos and read books. "Tushar Roy - Coding Made Simple" on YouTube was a massive help. Some books I've read: Cracking the Coding Interview, Programming Interviews Exposed, Programming Pearls, Hacker's Delight, Mythical Man Month, Boolean Reasoning: The Logic of Boolean Equations, Understanding Linux Network Internals, Introduction to Algorithms CLRS, Return on Software: Maximizing the Return on Your Software Investment, Software Estimation: Demystifying the Black Art.

I read (past and presently) a lot of business and finance books as well. Also tons of books teaching soft skills, which is hugely important.