Post your mistake here - warn others

The most common mistake in trading is overconfidence. In trading, Confidence is good but overconfidence is dangerous.

My biggest mistake was entering in Forex without getting some good knowledge and skills and it harmed my account a lot but after this blow, I decided to learn the things again and now making good trades but still little profit with little investment.

Never over-invest in a greed of earning more profits. Make sure you only invest as much as you can afford to loose.

I agree. How does one differentiate between investing and overinvesting?

Most traders lose their money because of their low knowledge about trading.

Every trader should learn from Mistake. If a trader has not learned from the Mistake. But he will indulge his mistakes and this is where his success will stop.

my biggest mistake was getting in without stop loss. maybe became much over confident in the beginning

That’s true. Small investment is good for new trader. At the beginning, I blew my account couple of time.

it's okay to blew up but it's never okay to blow up hard-earned with no clear management, have seen many regret over.
micro lot size should be a beginner's training, giving more time to practice and exprience the pattern how market moves.

Over trading and over trading!!
Please don't fall prey to this one, can take you so so close to losses at times.