Every US-listed company files a 10-K each year with the SEC: audited, legally binding, free to read. It's the primary source, and everything else (this site included) is derived from it. Reading one is mostly the skill of knowing what to skip.
Start with three numbers across five years: revenue (is the business growing?), net income (does that growth reach the bottom line?), and free cash flow, which is operating cash flow minus capital expenditure (does the profit turn into cash?). When all three rise together, the business is telling a coherent story. The divergences are where it gets interesting: profit without cash flow often means aggressive accounting, and cash flow without profit often means heavy depreciation.
Then the balance sheet: total debt versus cash. Debt isn't evil. It's leverage, and it cuts both ways. As a fractional owner you own a slice of that debt too, and this site shows you your literal share of it.
Every number here links back to the exact filing and XBRL tag it came from — the superscript footnotes on each company page. Click through sometimes. The goal isn't that you trust this site; it's that you stop needing to trust anyone.