Your best trading/investment advice?

Your best trading/investment advice?

My Trading and Investment advice has always been the same.
Knowledge is needed to be good at investing and trading. In addition to knowledge, experience is also needed. The more experience the better. A person who has never made any money in the stock market is going to have a harder time investing compared to someone who has traded stocks for a few years.
You need to know the value of your portfolio on a daily basis, you need to know the value of your portfolio on a weekly basis, and you need to know the value of your portfolio on a monthly basis. You also need to know what your long-term returns are.
I would say the best investment advice is to learn as much about the stock market so that you can become a skilled investor, but you should also learn about financial markets and economics so that you can invest and make a profit.