TradingView is a social platform for traders and investors (think Bloomberg and LinkedIn rolled into one). Free charts for financial markets and talk to over 1,500,000 traders about trading ideas in real-time.
I started using TV when I started paying more attention to the cryptocurrency market. Since I started using TV, I have become a bit smarter about my investing practices and have started looking at stocks using the tool, not just cryptos.
Great analysis tools, vibrant community, customization
Slight learning curve, especially if you aren't versed in financial securities and the respective tools.