By putting aside some regular portion, just like fixed deposits used to be. It is a type of investment or opportunity to make a profit. "Buy low, sell high" is an asset that you hold for the long term, not something that you "buy when the market is up and sell when it's low".
Those who have held Bitcoin for the past few years have undoubtedly seen how profitable it can be. However, for beginners looking to buy Bitcoin, understanding the phrase "Buy low, sell high" is quite easy. However, implementing it can be challenging. Not everyone who is new to Bitcoin can determine the lowest price for Bitcoin. Because, if you're talking about the long term, the current price could be lower than the future price.
Most beginners hesitate to buy at the current price. If you don't want to buy high and sell low, strengthen your finances. Your long-term investment will be quite secure.