Blogger is a blog-publishing service that allows multi-user blogs with time-stamped entries. It was developed by Pyra Labs, which was bought by Google in 2003. Generally, the blogs are hosted by Google at a subdomain of blogspot.com.
Having a blogspot blog is not a bad idea but it requires much policy and which you need to abide by but today we are going to be talking about HTTP Secure (HTTPS) which is an adaptation of the Hypertext Transfer Protocol (HTTP) for secure communication over a computer network, and is widely used on the Internet. In HTTPS, the communication protocol is encrypted by Transport Layer Security (TLS), or formerly, its predecessor, Secure Sockets Layer (SSL).

This process requires no ssl certificate it is totally free and it is enabled for custom domain name directly from blogger.com that means there is no need using cloudflare.

Step 1
Sign in to Blogger Using draft.blogger.com
Step 2
In the top left, click the Down arrow .
Step 3
Select the blog to update.
Step 4
In the left menu, click Settings Basic.
Step 5
Basic. On the right, select Yes under “HTTPS” >

Note
Change HTTPS availability to YES
change HTTPS redirect to YES
Step 6
Now after this process an automatic refresh page will occur just wait for less than 2min and thats all you need.