If only all prediction were to come true!
If you KNOW what your reason for investing is you won't get it right all the time, but you should get more right than wrong - as I do. This includes the global stock markets and other investments including gold in which I have been investing for some 42 years.
The way to profit is to line up the potential investments, working out what are the good and bad points. From that it is possible to develop some expectations about future price developments. Based on the price expectations you simply invest only in your top ten or twenty.
They won't all work out.
From time to time you can re-visit the reason you invested. If the reason has been fulfilled or if it no longer exists, it is time to re-examine the situation.
On the other hand, if you DON'T know what is good or bad about the investments you make, it's like playing in a casino. You might lose.
That's absolutely right.
I just started investing/trading and it has only been some months(maybe a year), not more.
I think you learn with time.
Experience plays a huge role.