Yes investing in multiple altcoins is the best way to minimize risks as even if one coin disappears you always have an opportunity to recover your loss from other.
Yes , but you must has enough amount of bitcoin for recover your loss also you must make balance between each coin you invest and if you can , learned from your experience about choosing a right coin , when you must sell it or buy it .It would be better to calculate first your profit and loss if you buy and sell an altcoin for that price and then when a price is hit and a position was triggered then you can adjust accordingly your target price for other altcoins. The key here is to have patience in order for your target price price to be hit and to recover any losses if ever you have one. Observing or studying also the movement of the coins will be a big help in choosing the right one.
