Do you save your investment theses / models to the cloud? Do you put your research into concrete writing? Or do you just feel a good vibe and then buy the stock, and then X years later wonder what you were thinking?

Sorry I worded this kind of rudely, but it is something I wonder a lot about. For the last (new) stock you added to your portfolio: did you put anything into writing re: your thesis on the business model, growth rate #s, valuation / multiple #s, etc.? Or do you just kind of read something online and then buy it?