You can earn PI by connecting with the community of PI and making your own simple contribution to the community. The more you contribute the more PI you earn. To start earning PI, you have to register yourself in mobile (PI APP) through a link received from the PI community. It is mandatory to open the PI APP once every 24 hours and start mining (Earning) by pressing the tap button given in the app. After that you can increase your hourly PI earning rate by inviting your trusted friends and family. After 3 days, you can further increase your earnings by building your security circle. This step contributes to the security of the network. Keep in mind, the first members of the network are at a higher rate than those who come after them.