To date, financial partnerships are very popular. This is a permanent and stable type of income, since the number of financial institutions is only increasing, the number of people using these services is also increasing.
It is working with affiliate programs that allows many to receive passive income for a long time. All you need is a desire to earn money and an audience to which you can recommend certain services and get real money for it.
At the same time, a large selection of affiliate programs allows you to work in the field of interest to you.