I have Raspberry Pi and I would like to know how I can connect to it from my smartphone to be able to interact with some apps and do many other cool things remotely. Is it possible and how I can do this?
Yes, this is possible. You need to install tightvncserver on your Raspberry Pi. This tool allows connection between your Raspberry Pi Desktop and any other device, including smartphones.
Also, the VNC ViewerApp (https://www.realvnc.com/download/viewer/raspberrypi/) should be installed on the device. After the preparation, you will be able to connect to your Raspberry Pi from anywhere using your smartphone.