One particular strategy of trading can't be use all the time.
Buy low and sell high will work all the time. It is an age old method and it always works. Point is that most traders fail to use it properly. They buy when everyone else is buying and sell when everyone else is selling, while they should be doing the opposite.
Although it is completely subjective, I feel that the point the OP is trying to make is day trading strategies and attempting to gamble on the day trades. Nothing something I prefer, but yes the buy low sell high might not be possible to perform here.
Trading is a competition between you and other traders, just like an Olympic race.
That is incorrect. The end result of a race is winning or losing. The end result of trading is neither. You gain a profit only if you sell high or withstand a loss only if you sell at low. But that does not mean that you lost the money.
If you want to trade everyday and make a living out of it, you'll have to never stop learning and will have to keep adding new skills to your arsenal.
Again incorrect. A professional trader does not learn new things everyday because that everyone can do - it is not a battle of knowledge but a battle of timing and nerves.