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.
Looking at your profile, you registered on 25th of August 2025, meaning that you have barely stayed up to 2weeks here, I welcome you first and I will advise you to breath in and out first, relax your nerves a bit, @Hridyansh Labs our discussion here is centered on the good strategy that we can use to invest in bitcoin for a long-term and every thing that's has to do with Bitcoin generally, please you're advised to stay on the bone of contention no form of deviation, no matter the knowledge you think you got, just know that you're still a newbie whether you like it or not and the best you should do to learn hear is to read through to understand what's been discussed here before you contribute, as a newbie I believe you should be more concerned about how to start and even though you've started already, the next thing you should do is to put up strategy measures on how to sustain your investment than giving advise, you're still in your early stage, if people keep seeing you mentioning crypto, it will look as if you're not serious, dude my sincerest advise to you is to learn before you teach, it will help you, once more we are talking about Bitcoin investment, it is better you ask question relating to that than trying to deviate out of context, I think this will do us good.