Investing is simpler than trading, and the simplest investment strategy is to buy a fixed amount every fixed period. For example, buy $100 weekly or $1000 monthly. Over time, you will notice that your investment portfolio grows well, even if there are some declines at times.
In investing, you must invest and learn to develop this strategy. Instead of buying at a fixed price, you will determine times when you buy in larger quantities and times when you buy in smaller quantities, and then develop when to buy and when to sell.
That's for those who always time before making investment, once the market show's decline they might choose not to invest in that particular time, they will keep timing until the makes show's green that's when they can invest, this timing method something can make you lose a very huge opportunity. However the strategy of buying at a fixed amount every fixed period I think that's the simplest strategy but when doing that you have to make sure you're investing in a profitable coin like bitcoin so that you won't regret at last.