I would like to start daytrading altcoins, but I need to know which ones are best to work with.
I would suggest you to first learn reading technical charts as they are very helpful to taking entry and exit at right time. For trading ADA (cardano) is very good nowadfays, this coin is showing excellent performance during the past weeks. There is very good update of ADA coin, they are going to Launch smart contrats on their platform on 12th Septmeber, 2021. This news can boost its price to new ATH.