Let's Encrypt is a non-profit certificate authority run by Internet Security Research Group that provides X.509 certificates for Transport Layer Security encryption at no charge. This nonprofit Certificate Authority providing TLS certificates to 300 million websites. ISRG celebrate their 10 years of helping build a bright internet.
Thank you Let's encrypt for this kind of Greet work for us.
Here is the command list
Step 1: Will Create .acme.sh file
curl https://get.acme.sh | sh
step 2: second command
.acme.sh/acme.sh --issue -d example.com -d www.example.com -w /home/webrootroot/public_html/example.com --server letsencrypt
Here is my example
.acme.sh/acme.sh --issue -d sellerdemo.enajam.com -d www.sellerdemo.enajam.com -w /home/enajgcai/public_html/sellerdemo.enajam.com --server letsencrypt