Just imagine. You have an idea for your project. You have a device which will send your data to website. Or you will control your device from website.
And there is problem. How to display your data on website? And where? How to control the device from website?
This application RemoteMe.org will help you.

You find a few tutorials how to set your device, the website for ESP8266 and RaspberryPi.

Sending data from ESP to website: https://remoteme.org/2018/12/26/send-data-from-esp-to-the-webpage-with-minimal-effort/

Simple weather station: https://www.instructables.com/id/Simple-Weather-Station-Using-ESP8266/

Home automatization with NodeMCU and RemoteMe.org: https://www.instructables.com/id/Home-Automation-Using-RemoteMe-Arduino-Remote-LITE/

Controlling of GPIO of RaspberryPi: https://remoteme.org/2018/12/11/rasbperrypi-control/

All tutorial you find on https://remoteme.org/blog-en/