SSL is secure connections from a web server to a browser,
When installed on a web server, it activates the padlock and the https protocol. Typically, SSL is used to secure credit card transactions, data transfer and logins, and more.
How to Get Free SSL Using Cloudflare, Please follow below step
1)Go to Cloudflare and Login
2)Click Add Your Site
Select Free Plan and Press Confirm
Change Name Server
Click DNS Button and Click Status and make it Yellow Color as below Picture
Now Go to Cryto>Select “Flexible” and wait in 24 hours until Active, After Active Certificate Change “Flexible” and Select it “Full”
Scroll Down and See Automatic HTTPS Rewrites,Now Click turn On
Now Check your Website .Thanks