I'm sure we have some newbies here and even people who are unfamiliar with maybe some of these sites, here are a couple of investment sites that have always helped me when I needed something during my investing days. You can definitely add in the comments :)

Finviz: Technical analysis, market scanners, heatmaps, financial indicators, stock information.
SeekingAlpha: Stock news, investment opinions, analysis, recommendations, live discussions.
YahooFinance: Financial news, stock charts, investment information, portfolio tracking.
Simply Wall St: Fundamental analysis, financial indicators, stock rankings, investment tips.
JustETF: ETF analysis, comparisons, allocation strategies, costs and returns.
Bloomberg: World news, market analysis, economic indicators, financial instruments.
Google Finance: financial news, live stock prices, portfolios, economic calendars.
CNBC: Economic news, live broadcasts, market commentary, expert interviews.
Financial Times: World financial news, market analysis, economic trends.
MarketWatch: Financial news, stock market information, live charts, investment analysis.
TradingView: Charts and technical analysis, indicators, trading signals, social network of traders.
CoinMarketCap: Cryptocurrency information, prices, market capitalization, trading volumes.
Your Broker - E.g. Interactive brokers, Degiro, etc. also provide a wealth of information you need to know to make your investment decisions.
And last but not least Bulios: Investment analysis, recommendations, portfolios, community, and everything you need to invest!