Let’s Encrypt by EFF is the web certificate for ensuring that your website stays secure in HTTPS mode. The aim for the website owners is about making things easier in enabling HTTPS support for the website. If you do have the Unix/Linux based OS, you should be able to install this prototype certificate for your website running on the server. Hell, you can also try using this on your Raspberry Pi device as it is running the embedded Unix/Linux based OS as well. Maybe I should be able to find and buy a Raspberry Pi if I can but if that’s not found from the retail store, I guess that buying stuffs like that is not an easy thing.