I'll bite
@FATCA. Due to the many links, I suspect this might get flagged.
@Sols please unban.
There is no such community. 99.99% out there who you might think they are, are only outlets for false prophets who are after subscription fees for a worthless service. Trying to trade their advice will lead to serious underperformance or even disaster with blown up accounts. There ARE "communities" but those are call hedge funds or prop trading or pod shops like Citadel, Point72, Millenium etc. The closest of what you describe might be loose groups on Twitter who would group themselves into what is known as "FinTwit" ("financial twitter"). But you will rarely find actionable advice, and without estimating each persons background you will have a really hard time to distinguish sales pitches from little nuggets of wisdom.
You can succeed, but you will have to put in serious work, like in a business. Let me offer a few shortcuts anyway.
The way you envision it, it is impossible to call tops and bottoms. Read "The man who solved the market" by Zuckerman for an introduction to the most successful fund there is. While markets are not efficient, they do have traits of a random walk. It is like trying to predict where that one CO2 molecule will be in 24 hours that you just exhaled. In your house? Maybe. Carried away 500 km by a storm? Possible. You see where this is going. Market price movements are similar.
Listen to the four points in
There are maybe a handful more fringe cases to
make money (some legal, some not) but for the purposes of calling tops and bottoms he sums up the possibilities. You will realize only #1 is an option for you in all likelihood.
The first innovation away from an analog to putting everything on black in roulette, i.e. a bet on single stocks or even a broad equity ETF, will be examining the working of model portfolios like the Golden Butterfly by Tyler. Check out
https://portfoliocharts.com/charts/portfolio-matrix/ for some portfolios and what they contain. You should also watch
to understand why different asset classes are mixed the way they are. Why is this useful for you? By mixing, single assets will still swing about madly. Like US stocks seeing -50% draw downs every decade or two. But with uncorrelated assets put together, the volatility of your portfolio in total (!) will be much reduced. You might then not even want to call tops or bottoms anymore, because the portfolio will never stray from a +20% to -20% corridor. You can visualize this nicely on a site called testfol.io. Compare pure US stock market with Golden Butterfly from Presets.
If you still think a little more oomph might be desirable, you'd have to get into trend following and momentum strategies. For an introduction, read all free articles about "Hybrid Asset Allocation" on allocatesmartly.com. There are a few principles like absolute, relative or even cross-asset momentum that have stood the test of time and importantly markets have not arbitraged them away. I will not go into why. You will still not be able to call tops or bottoms, but through some math you can follow the market up and down, thereby lowering draw downs and pushing compound annual growth way beyond what is possible with a diversified portfolio as describe above.
I estimate it will take you a minimum of 1 year of unpaid full time work to get something off the ground. You will need a bunch of math especially statistics, Python, Pandas, ib_async,
IBKR API etc. By the second year you will have produced a nice heap of failed ideas. And you will have fooled yourself 5-10 times with systems that look good on paper, but are in one way or another flawed. Like leaking data from the future, using not survivorship bias free data, slippage and trading costs killing any profits, horrendous draw downs etc. Final advice here is that less is more, trade less not more. For some more ideas, read the Jack Schwager Market Wizard books. He interviewed practitioners who actually succeeded.