There are several apps/websites to learn touch typing from the start, you go from using 2 fingers in their proper places up to the whole hand with exercises that go up in difficulty over time, just do sessions of a few minutes each day and thats it.

my personal recommendation would be https://www.typingclub.com/

• Not everyone that uses Linux is against proprietary software or only uses FOSS.
• There are people that just heard of Linux, are just trying it out, or have an issue, and already use Reddit, or is what the search engine points them to go for help, or to ask questions.
• Reddit has a lot more reach for the common people than any other platform at the moment, there are still people that prefer to ask on Reddit, than go to a specific forum or another platform to ask (If I remember right, it still happens with some apps like Jellyfin that moved out of Reddit, but people still ask there)

These are just a few of the reasons that come to my mind.