Where can I get a free crash course on stock market investing

There are lots of free crash course on the stock market, you can watch YouTube learn about the stock market, there are various youtube channels available like

Khan Academy

L2Inc

Bull on wall street

Fous4 Trading

Sharemarketshiksha

Preston Pysh etc

Or you can try Massive open online courses it is very popular nowadays, Its aimed unlimited participation and it’s an open access, you can access through the internet.
However, if you want to learn fundamental and technical analysis you can join various institute like
NIFTY trading academy
National stock academy
Radical Institute of stock market,
Maheswari institute,
Arihant capital market,
Kalpataru Institute of capital market,
Sharemarketshiksha etc.

(Source: https://www.quora.com/Where-can-I-get-a-free-crash-course-on-stock-market-investing)