In the process of trying to find educational videos on microcaps & penny stocks, I found most people just want to sell you something. It is no wonder there is so little "legitimate" education available on penny stock investing.
Learn & Practice the Basics of Buying a Stock - Even If You Spend $100 - Preferably with a reputable online bank or brokerage that charges you < $20
This is 1.5hrs but is great if you have never bought a stock before and don't know where to start.
This one is 1hr and likely just as good for learning the basics.
Stock Market Order Types. Applicable from microcaps to large caps
Tim Sykes has been around a long time and I suspect has had his share of big wins and big losses. He is in the business of making money from subscribers and publications so if you take that into consideration, he still has good free Youtube content. His channel is available here: https://www.youtube.com/c/TimothySykesTrader
1) OTC Markets Group (U.S.) - https://www.otcmarkets.com/index.html
2) Canadian Securities Exchange - https://www.thecse.com/
3) Toronto Stock Exchange - https://www.tsx.com/
4) TSX Venture Exchange (Canada) - https://www.tsx.com/trading/tsx-venture-exchange
5) AIM in London - https://www.londonstockexchange.com/raise-finance/equity/aim
6) FSE in Germany - https://www.boerse-frankfurt.de/en
7) ASX Australia - https://www2.asx.com.au/
8) NSE India - https://www.nseindia.com/
Their "Bullboards" are very popular for CDN microcaps
Reddit is the home of "WallStreetBets" - a U.S. trading beast
Mostly mid to large cap but does have micro cap boards
Diverse - run by a UK company
Message boards and extensive independent research & analysis
Kitco.com has been around since the 90's and has great content
Similar (on a much smaller scale) to Twitter but with a stock specific focus.
Several of these exist but here are some of the better ones in no particular order: (1) Yahoo Finance (2) Marketwatch (3) Stockwatch (4) TC2000 (5) Zacks (6) Trade Ideas (7) Finviz (8) TradingView (9) Stock Rover (10) Stockcharts