you need to buy a device called asic, this device is plug and play if you have the psu, which you can buy separately, it will earn money for you without doing anything, this is a plus that investors don't realize
versus trading where the stress is higher, i prefer mining over trading because of this reason too, but before all this you need to look at your electricity rate
the suggestion is to buy a antminer s9, other miners are not competitive, if you want to mine altcoin, the L3+ is a very good deal for litecoin