I will be starting to do trading on cryptocurrencies.
Did you mean trading or just converting fiat to coin? If it is the real trading, know that it is very risky. You have just started to know about cryptocurrencies, you have to take it slow and not rush.
With that being said, I also want to take this opportunity to ask, what would be the best cryptowallet to use at this time?
You can play round with this:
https://bitcoin.org/en/choose-your-walletFor bitcoin wallets you can choose Electrum which I can also recommend, but it is an online wallet, but going for its cold storage for better security, or you can buy a hardware wallet like Trezor instead.
Trust Wallet, the most common nowadays is widely used and also I use it to store my trading crypto assets. use is quite simple and for beginners, I'm sure there will be no disturbance. easy access from the most profitable smartphone.
He should know that Trustwallet is close source, but it support many currencies. I will rather prefer to go for an open source wallet which would make me to prefer hardware wallets like Trezor that is open source and yet support many cryptocurrencies.