Keep a record of every purchase and sale: the date, the number of shares, the price, the currency and exchange rate, and the costs. Most brokers provide yearly statements, but your own overview makes tax returns easier and shows how your investments have really done.
Measure honestly
Include costs, taxes and currency effects, and compare with a simple index fund. That comparison tells you whether picking individual shares has been worth the effort.
This content is general information, not investment advice.