Cloud mining - mining cryptocurrency without buying your own equipment, using rented equipment, which can be located on another continent. In this case, you do not buy equipment, do not deal with the issue of its placement, or incur additional electricity costs, but simply pay a fixed amount for using other people's video cards or processors. It sounds like a very convenient option, but I do not know how profitable it is for investment. If you want to invest, check out this
Investor Junkie article that will let you know which investments will be profitable and safe. After all, investing is a good source of income and a way to ensure a comfortable old age in retirement.