I want to understand how I can earn income from qtum coins, except from the growth of their value, whether there are other ways to profit with the use of qtum coins. (minig, masternode, etc.)
There's no Proof-of-Work mining, only staking. This means if you own Qtum tokens, you're able to gain rewards for your computational resources. If you stake a block, you are helping the network process transactions, and you will receive a 4 Qtum reward for your efforts.
We don't allow masternodes, this functionality centralizes a network, and isn't available to everyone. Anyone can run a full node for our network, you only require an internet connection and a device. There are no rewards for doing this, but people do it anyway, like the Bitcoin network for example.