For a long time, I wished that I could have used the SSL certificates. But I didn’t know https://letsencrypt.org/, issuing free SSL/TLS certificates. till someone taught me on a certain chat. I thought of waiting for the release of the ACME v2 on 27 Feb. 2018 since it has the wildcard certificates function. But I registered it on 04 Jan. 2018 after all. The release of ACME v2 was delayed.
So as you could see, except some, my websites had already got encrypted by SSL. And today, I installed the wildcard certificate since ACME v2 has been released.