I think is better to trade top 10 crypto based on market cap because the fundamental is better than others. Price action of crypto is unpredictable and sometimes the market crash just a few minutes so we need to use stop loss and trailing stop as risk management.
If OP wants to look for short-term gains, then trading top 10 crypto based on marketcap is not really a good strategy. The reason for that is because the larger the market cap, the price is less volatile compared to low market cap coins/tokens. But of course this doesn't mean OP should choose coins with low marketcap, that's risky too.
For OP, I think you should make a clear goal first, do you want to do short-term or mid-term trading, and after that learn what's TA and FA and their differences. In other words, build your own skill first. That's important for you because in the internet you don't know which analysis is true if you don't have the basics.
Clear on point. If he's really new in crypto trading better feel the market first.
Read tons of threads here discussing wide range of topics.
If he will follow whatever is suggested to him, then, he will lose his money in no time.
But the very simple mantra in trading -
buy low, sell high. But what coin? That's up to you.
You need to study the coin first. It's not an easy task. Don't rush yourself in this world of crypto trading.