I will install free SSL on your website

Let's Encrypt is a certificate authority to provide the SSL and after installing LetsEncrypt SSL you can access website using secure URL https. Its a free and no need to purchase or pay for the SSL certificates.

For modern browsers we generate a private key in your browser using the Web Cryptography API and the private key is never transmitted. The private key also gets deleted off your browser after the certificate is generated. If your browser does not support the Web Cryptography API then the keys will be generated on the server using the latest version of OpenSSL and outputted over SSL and never stored. For the best security you are recommended to use a supported browser for client generation. You can also provide your own CSR when using manual verification in which case the private key is handled completely on your end.