Are there any good websites for tracking stock prices?

Check "Tijori Finance"[1][2] if you want more information on companies than just stock prices such as how they make revenue, their sales breakdown and multiple key performance indicators/operational metrics (eg. how much did they spend on R&D compared to their competitors)

disclaimer: I work for tijorifinance

[1]https://tijorifinance.com/

[2]https://tijorifinance.com/us/

This question might need more details.

Google finance? Yahoo finance? Webull

Capital Market Laboratories: https://www.cmlviz.com/home

Also technical analysis with precision is free (for now) https://stock.trademachine.com/register/free-membership/

Your discount brokerage should have a reasonably solid web interface for equities data. Koyfin.com is also decent.

For fundamental data and fundamental based screener, I found stockrow.com very good. For technical based screener ( It has a lot of fundamental parameters too), finviz.com is very good. ( It has ads though) I would love to hear from others on any other good tool with clean UI.

You can set up a free account at a place like Charles Schwab and get pretty good data. If you're really into technical analysis and charts you can download free software called thinkorswim from TD Ameritrade

Yahoo finance has charts and all sorts of data. I think you can setup alerts. I believe they have APIs to access it too.