Mistake one: confusing activity with progress
New investors trade too much. Every trade feels productive, and the brokerage statement at year end usually says otherwise.
Frequent trading converts a small edge into a large cost. If you cannot explain in one sentence why you bought, you probably should not have.
Mistake two: ignoring currency
If you hold US stocks but spend in another currency, your return has two components: the stock's move and the exchange rate. A stock up 10 percent in dollars is not up 10 percent for you if your currency appreciated 8 percent.
Most beginners never check this until the first bad year.
Mistake three: position sizing by conviction instead of by risk
The stock you feel most certain about is the one most likely to hurt you, because that is where the oversized position goes. Certainty is not information.
Size positions so that being wrong on your best idea is survivable.
Mistake four: chasing what already worked
Buying a stock because it doubled last year is buying after the information has been priced. Momentum can persist, but it requires discipline about exits that beginners rarely have.
The pattern usually ends with buying high and holding through the decline.
Mistake five: treating a low price as cheap
A stock at 4 dollars is not cheaper than a stock at 400 dollars. Price per share is an arbitrary number determined by how many shares were issued.
Only the relationship between price and business value tells you anything. Beginners routinely buy the 4 dollar stock because it "has more room to run."
Mistake six: not writing anything down
If you cannot state why you own something, you will sell it at the first scary headline. A one-paragraph note per position, written at purchase, stating the thesis and what would break it, is the cheapest risk management available.
It also makes review possible, which is how you actually improve.
What actually helps in year one
Fewer positions, larger cash buffer, a written reason for each holding, and a rule against adding to losers in the first month. None of this is exciting.
All of it is what separates people who are still investing in year five from people who stopped.
A final note on expectations
The first year is for learning how you behave when money moves, not for maximising returns. Treat it as tuition.
Keep the amounts small enough that a mistake teaches you something instead of ending the experiment.
