There is no ideal number. My favorite advice is always this: Invest an amount that wouldn't hurt you financially even if you lost all of it. Although we all hope for the best and want to make profit, the crypto environment (especially the altcoin environment) is highly volatile and you never know what might happen tomorrow.
I could not agree with you more! Invest with any amount that would not hurt you financially or better still, research a project before you invest. Though the crypto environment is volatile, a coin like
Thorecoin THR is already listed on an exchange and with
Modern Finance Chain MFX having the prospect to follow suit.