Frist of all you have to add some strategy in your trading.As many types of analysis are done in trading but by keeping in mind fundamental and technical analysis, We can avoid the risk of trading.We should never make our investment in a single coin because is the risk in trading. If we make our investment in a single coin, we cannot control the risk.
If you are an investor, investing in only bitcoin is what I mostly recommend. Investing in bitcoin is less risky if you are holding it for a long time, and you don't need to diversify your portfolio. But I know some people just prefer investing in altcoins, which I don't really see as a nice idea. If you go all in with an altcoin, then you are taking unnecessary risk because if the altcoin crashes, then all your money is going down with it. But if you diversify your portfolio, if some fails you, then you might be lucky to recover from others.
In trading we must be able to place targets and stop losses logically,
Stop loss is really important, actually, I don't use it because I am always online monitoring my trade, but I do recommend newbies to always make use of it in case the market goes against them, it's going to cut their losses, but some newbies don't even know that stop loss exists, all they want is to start trading and make money. They don't know the basic things that they are supposed to know before trading.
from which If we want to trade short term, I think using Bitcoin is enough, but if we want to invest long term , I think asset diversification is a better choice
For both long-term and short-term investments, bitcoin is still the best. Don't be deceived by what you hear people say. Investing in bitcoin will give you peace of mind.