What you must seek is to how to deal with the price behaviour of your chosen alts and also to bitcoin. You will just get random responses here that will make you confused. The goal was to "buy low sell high". Try to make your own analyzation on how can you make a good strategy in order to make a good "buy low sell high" plan.

Important thing here is knowledge, you will minimize the risks of losing if you acquired knowledge so take time building your trading progress.