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adventofcode
Advent of Code solutions of 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022 and 2023 in Scala (by sim642)
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
Lol, I mean the December event with coding problems: https://adventofcode.com/
Go to Codewars and start doing challenges there in the chosen language. Use the starting code as a base and as you need features, google them along with the language. You can look at other people's solutions in the same language, compare them to yours, and try to figure out any syntax or features you haven't already learned.
I like learnxinyminutes for learning absolute basic syntax and idioms of any language. It's not a tutorial, more like a quick starting-out chest sheet for any language.