Learning about trading through mistakes can increase the process of losing capital for a trader so he should spend more time learning so that the amount of losses can be significantly reduced.
TBH, I don't get your point. Why learning from the mistakes will lead to more losses? 
When you evaluate your trading strategy and get some lessons, you probably will try to apply a better strategy. In this way, you will reduce the chance to get losses in the future because you are improving your strategy in trading. Even, this way will lead to a higher chance of getting possible profits. Using a more proper strategy will make it easier to gain profits.
By entering the market and managing the follow up accordingly a trader becomes experienced and should maintain a constant buying trend so that holdings increase over time and the potential for higher profits.
Constant buying? What do you mean, dude? 
If you become a more experienced trader, you will understand how to trade effectively. You won't always think about buying (entry) but you also must think about exit (selling). Analyzing the fundamentals and market trends, will be more often when you have enough knowledge and experience. In this way, you won't also keep buying but you also keep selling in a better time.