tl;dr Go, of course. rust it just too fugly and has no worthy support on windows and in IDEs. sure, you may love it but if you check out jobs, it's like 100:1 for Go. rust is and will be an exotic language for very niche use cases.
This will be overlooked but this is actually the answer to your question - buy some stock. Any stock. Just one stock if you are low on cash. Just buy it. Now. Not tomorrow, today. It will force you to learn about the business you bought, how it is conducting its business but also how the stock market works. Then how the global economy works and how things are interlaced and connected. In few months you will understand more than any school or book could teach you.
let the downvotes begin :)