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I found medium / towardsdatascience to be extremely useful. What I usually do, is Google "Algorithm X tutorial medium tutorial/from scratch" (e.g. K means medium from scratch). There are going to be tons of them, so just find one that seems to explain it in plain english, has code is beneficial but not a must, and not too long. But you'll get the hang of what works for you. There are a lot of algorithms, so don't get overwhelmed. You will most likely not use most of them, so it's important to remember that memorizing things is probably not effective as you will forget them in a month or two. Focus on the general idea, code them from scratch without looking at other people's code with fake/simple datasets and you will most likely remember them for a long time. I spent a day coding genetic algorithm from scratch over a year ago and I still remember every step because how frustrating it was