Diversification is key. Do not put all of your funds into one coin only, because it is very risky. If a signal seems reasonable to you, you can invest up to 10-15% of your seed capital. I do not recommend investing more than this, but of course in the end it is up to you how much risk you want to take.
Always keep in mind that you need to use stop losses. This will minimize your losses and ensure that you secure your funds with each move. It's better to take small and controlled losses sometimes. Remember that there will be enough other opportunities in the future to make profits.
If the market is very volatile, it's better to make smaller investments. A good amount to invest if there is a lot of movement is a maximum of 0.2-0.3 (3-5% of funds) btc for each coin. With a lot of fluctuation, you will still be able to make some nice returns, just try to be consistent and secure smaller profits safely whenever there is an upward movement.