I'm just starting to learn about quantitative finance and I'm overwhelmed by the amount of tradable securities out there. I'm seeing all these things like VXX, TLT, TMF, SPY, SPXL, HYG, VWEHX and so on and have no clue what they are (have to google them each time). I'm hoping to compile a list (or be pointed to a list) of all major categories of tradable securities and the ETF's that track them, and how they are calculated, so that I know what's out there and start to understand other people's trading strategies.
Is there a good place to start? What's the best way to learn about all of these indexes/securities? Does such a list exist?
Sorry if this is off-topic, I'm just hoping to get some pointers from experienced quants on getting started. Thanks all.