[Exercism](https://exercism.org/) is a great community for exercise based (and mentor based) programming language learning.
They have always been strong supporters of Nim (they use it in production in one of their tools to manage the infrastructure). There are a number of Nim exercises ready and a strong and competent sponsor in @ee7. They are always in need of support (both economical and in terms of time invested in improving the platform and the learning track). I would suggest people checking it out if they do not know it yet and consider helping out. It could be a place where we could invest more as a community (I wish I had more time to dedicate to it). I do not know how those other communities work but of course if there is a similar mechanism where outside help is encouraged and appreciated, people could also help there depending on what they like best.
