I am fairly new. Websites/Apps that I use:
Simply Wall St.: You get a free trial for 14 days and it does a great job of breaking down different aspects of different stocks (value, future, health, dividend) into a very easily interpretable snowflake analysis (easier to visualize yourself than for me to explain). I believe @AriGold2.0 pointed out that you can use fake email addresses to keep getting the free trial.
Investing.Com: I prefer the App to the Website, but it provides nice, real-ish time data on stock prices. If you use brokers like WealthSimple, they are often delayed by as much as 15 minutes and can be really not all that useful.
MarketWatch: Kind of the same as Investing.Com, but its App will also deliver you news. Sometimes it is useful; sometimes it tells me that Hank Aaron died. Maybe I'm just naive, but I don't understand how this news will impact markets.
Cathie'sArk: Thanks to others in this thread, a substantial proportion of my profits have come from ARK ETFs. This site tells you what ARK is buying/selling. While I am still routinely putting money into their ETFs, sometimes I also use this as guidance for buying individual stocks.
BarChart: Useful for quick details on things like whether the 50-day moving average is above the 200-day moving average, etc.
WhaleWisdom: Useful for seeing what's going on with puts/calls by major hedge funds. Shows 13f filings (form that must be competed by funds that hold at least $100 million in assets).
MarketBeat: Similar to WhaleWisdom. Provides information on a lot of things, including information about Institutional Holdings/Attitudes towards a particular stock.
If you use Twitter, put "$" before any stock symbol and you can get information that was as well. I generally find people on Twitter to be a bit obnoxious/trying to pump up certain things; look for legit sources and filter out the rest.
I started with Simply Wall St. and moved from there. Good luck!