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cs-topics
My personal curriculum covering basic CS topics. This might be useful for self-taught developers... A work in development! This might take a very long time to get finished!
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Exercism - Scala Exercises
Crowd-sourced code mentorship. Practice having thoughtful conversations about code.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
You probably want to look for computer science fundamentals. teachyourselfcs.com is a great resource, and I personally really love the book 'Grokking Algorithms'.
Leetcode it's too dificult (and borin) for newbies normal human being. Try with exercism.org and reading about methods available in the primitive data type that exist in your lenguage. For example, there's some methonds ONLY available for String, also other methods available for Number, so, you start learning basic one and combining those methods and solve some challenges. Good luck, pal!.