Reading up
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Intro article https://www.investopedia.com/articles/active-trading/101014/basics-algorithmic-trading-concepts-and-examples.asp
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Technical analysis - https://www.investopedia.com/terms/t/technicalanalysis.asp
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Investopedia has some good links on various indicators, e.g. RSI, MACD, Ichimoku cloud etc.
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Datacamp has some good blogs