Free or paid, any topic.

https://youtube.com/playlist?list=PL4A0248AE2B0DF1A3

I found this series useful when getting into DC electronics. He takes topics very slowly and thoroughly. He's also got a series on oscilloscopes and a more advanced multimeter feature breakdown.

I'm not the OP, but thanks for that. It's something that I'm interested in.

Nice! I got my first multimeter for my birthday last month.

Jazz guitar.

https://www.youtube.com/channel/UCqepSCHTyWj4BzHxEEUNvlg

The nand to tetris course is very good for understanding the fundamentals of computing. Not just basic python, but the very building blocks of computing.

It starts from nand chips, than you build a ram, rom,cpu, and eventually a computer. For that computer you build a ALU and an Assembly like language. Than a complete operating system and a Basic like language. Than a more advanced language that is more akin to OOP and you eventually build tetris.

You can officially find it here, but it's a bit clunky UI. You might be better of finding the course on Udemy or Coursera or something.

7 hour complete Bash scripting course:
https://www.youtube.com/watch?v=Sx9zG7wa4FA

Biochemistry and Molecular Biology - How Life Works

A lecture series I found on the bay, basically it's third year biochem.

https://youtu.be/LiEUnlv2kjU

This guy is very well known already for car audio builds, but this video in particular was nice to have when I thought I destroyed a brand new Focal 165ES K2 speaker. Never gasped so loud in my life as I saw that screwdriver slip straight through the surround.

I watched this course on cooking knives years ago and I still use a lot of the skills from it. Definitely recommend it if you’re someone who likes to cook: https://www.craftsy.com/class/complete-knife-skills/

so splunk has some seminars recently and going into the next couple of weeks that are free and hands on. Unfortunately there is only one rookie one left. https://discover.splunk.com/Virtual-Workshops-AMER.html again actually having hands on and live in person instructor is very rare for free.

Freecodecamp used to help quite a bit.

Busuu for language learning. It's like Duolingo, but the main difference is that it actually teaches you the grammar, instead of just making you memorise random sentences. It also has some audio and video of native speakers, at least on the Japanese course. And each module ends with a prompt where you freely write or speak your answer (e.g., "What do you like to eat?") in your target language, and then it gets graded/corrected by native speakers in the community.

And for Japanese kanji specifically, WaniKani. Nothing else I've ever tried has helped with kanji, but their writing style and off-the-wall mnemonics honestly make it so much easier. And you get the first three levels for free, which is actually tons of content.

Extremely niche, but https://iidx.org/

This is a single guide that teaches you everything you need to know about how to play Beatmania IIDX, a fun but brutally difficult arcade game. Guide covers everything from setting up a new player profile to clearing the hardest skill challenge in the game, and even includes some music theory

I can't think of anything more helpful than this in terms of relative scale...

Linux - LinuxJourney

Linux/system administration - Sad Severs

Programming - LearnXinYminutes

Programming - Lazy Foo's SDL/C++ tutorials (Not sure how practical it would be to learn either of these anymore, but I enjoyed it when I went through)

Vim - vimtutor built in tutorial

Vim - Vim Adventures game to learn Vim's keys

Godot - Heartbeast's tutorials

CSS - Grid Garden

Web Design - Web Design in 4 minutes tutorial

Web Design - Visual design rules you can follow almost every time

SQL - SQLBolt

Guitar - JustinGuitar's Beginner's course (and beyond)

Music theory/guitar - courses from Signals music (many are pay what you want, he also has plenty of good info in his freely available Youtube videos)

Chess - ChessNetwork's beginner to master playlist

Blender - The Donut Tutorial

Pixel Art - Gas 13's tutorial

Pixel Art - Derek Yu's tutorial

2D Art - Drawabox

Japanese - Sakubi's grammar guide

Japanese - Bunpro's grammar references

Japanese - Tae Kim's guide

Smash Melee - melee.cookbook.gg

Melee - Advanced How to Play parts 1, 2, and 3 (outdated, but decent foundational stuff)

Melee - SSBM Tutorials channel

The question was a fun excuse to think about some old tutorials I've seen, and dig through the bookmarks. Any subject is a pretty broad ask tho. Out of curiosity, why do you ask? Are you just thinking about learning something new for the fun ot it?

Great list, thanks! LinuxJourney is actually what prompted my question. I asked it because I thought it would be nice to have a space for knowledge exchange where people could share courses they found helpful and others could learn something new. I heard good things about JustinGuitar before too.

Thanks! I’ve been looking for a new language learning app. I disliked a lot about DuoLingo but I have to admit that the streak system, spaced repetition (to an extent) and being able to access it anywhere from my phone were helpful features. I use Brulingua now, which also has audio from native speakers and lessons on practical, everyday topics, but it’s not available for mobile in my region and there’s no one to correct your pronunciation. I’ll check out Busuu.

Nice. Yeah, it's a fun topic, thanks for starting it!

JustinGuitar is great for sure. It's a little frustrating that he doesn't put tabs in the videos - sometimes that would save a lot of time. But you can get those too if you sub I guess. The song lesson library there is also super helpful.

Not a course, but consider joining the community over at !languagelearning@sopuli.xyz, always nice to see more folks learning.