I hope you are aware that there is a difference between crypto trading and crypto investment. What you are describing is crypto investment (buying the dip) and not trading. Trading has to do with short-term buying and selling of coins with respect to the volatility of that coin with the aim of making profit, while investing has to do with buying a coin like Bitcoin, in fractions or in whole depending on your cash flow, then holding the coin for a long time until the bull run starts.
While trading or investing, it is usually right to choose a reputable and more popular exchange that is used by many people. Also, a Bitcoin holder must be wise to choose good wallets like Electrum, Exodus, Blue, or hardware wallets.
Unfortunately, most people probably think the same.
In fact, what is quite important to consider when investing in crypto is our ability to analyze. Analyze well what coins will be taken, how long, and what strategy should be taken.
If it is for investment, then we should be able to analyze what crypto is able to survive for the long term, not just for short-term hype. The most concrete example is BTC for long term. This is beyond doubt.
but the problem is, many beginners actually make the wrong move at the start of their investment, namely they tend to prefer projects or coins that are currently hyped and heavily promoted, especially by influencers. This is something you must pay attention to, especially for beginners.