If these are some strategies that you may be ignoring, what are the common or used strategies? Almost all of us may have heard or used Dollar-Cost Averaging (DCA), Arbitrage Trading, and many lazy people hear Copy Trading or use it without knowing its name.
DCA if is not used correctly, will cause bigger loss for traders.
Arbitrage trading is risky because it depends on many factors and price difference, lag of trading signal, order fill up or not can cause a profit or loss for traders.
Copy trading is a worst one in my opinion because I agree with you too, it is for very lazy people who don't have their own thinking and totally rely on other people for their capital. They don't learn anything even they have many time in the market, profit or loss will be decided by author of those copy trading strategy.
In any case, the trading strategy above is the first step, and the more it increases, the more complex and profitable strategies you will use, but it is better to divide it into beginner, intermediate, and advanced levels.
For all trading strategies, to be safe, protect initial capital and get profit, risk management must be well enough. Without good risk management, a trading strategy can be considered as very bad.