You are absolutely right that it is important to know which currency you are buying first because the up/down and future prospects of each coin are not the same. A few times, we buy or sell suddenly due to market emotions, which later turns into regret. If it is BTC (Imagine Bitcoin), then it is normal for the price value to fluctuate in the short term. There have always been big corrections or dips in the history of Bitcoin, but in the long term, it is usually upward. Especially when there is a possibility of a halving cycle or super cycle in the market. It is often profitable to hold patiently. So it is better not to buy/Sell in a hurry here.

On the other hand...
If it is an altcoin (ETH, SOL, ADA...) and many coins, then the strategy is a little different. The price of altcoins is much more volatile than that of bitcoin. Usually, if an altcoin gives a profit of 20-30% or more from your entry price, then it is wise to sell gradually. Because many altcoins can rise sharply in the market at one time but later collapse.

The most important thing is to make decisions through technical analysis (TA). (TA means that technical analysis) Identify support and resistance levels. Try to understand the strength of buyers and sellers by looking at volume analysis.

At last, we know that DOYR is a very important part of our cryptocurrency. It is very important to do your own research (DYOR - Do Your Own Research) while making your own decisions and not just going by someone's advice. Because emotion or hype in the market can often lead you in the wrong direction. Good results can be achieved only through patience, correct information, and risk management.