LETS ENCRYPT BASICS

letsencrypt

Q: what you need to do for https ?
A: you need to get a certificate from CA(let's Encrypt is a CA)

Q: How to get a Certificate ?
A: in order to get a certificate for your website's
domain from let's encrypt you have to demonstrate control
over the domain.

with let's encrypt you need a software that uses 
ACME protocol which runs on your web host

so now there are two methods 
1. with shell access
2. without shell access

for those who have shell access we recommend to use 
certbot ACME client
(Automatic Certificate Management Environment) 

certbot will automate the certificate issuance and 
installation with no downtime.
Note: you can also manual configure if you want

if certbot does not meet your needs you can use other
ACME clients