Every time I see someone interpret large on-chain transfers or exchange hot and cold wallet movements as "smart money," my first reaction isn't to rush in, but to think: if I did this, what proof would I have for tax reporting at the end of the year... I sincerely advise myself to stop pretending to be cool and to keep transaction records early. Anyway, now I: take screenshots or export transaction histories whenever I deposit, withdraw, swap coins, or interact on-chain; save exchange statements and blockchain explorer links; put them all in one folder, named by month. By the end of the year, you'll thank this somewhat verbose version of yourself now, or else you'll be overwhelmed by a bunch of addresses and hashes, and your brain will just crash.