I work at a place where most people speak Spanish, and I want to be able to hold conversations with them. I’ve watched a couple of YouTube videos, but I haven’t been able to retain the information. I need to write down flashcards and notes. I’m wondering, and I don’t mind if it’s proprietary, what is the best and fastest way to learn Spanish?
Go live in Mexico for awhile. Nothing beats immersion. There is no other silver bullet and even that one won’t work if you don’t commit to speaking the language often and badly.