Hi,
If you see the Source Code, you will observe that most of them are already enqueued in the footer just above the body closing tag.
If some one is missing, it means it is enqueued by third party and we have no control on this, like photon.
If you are concerned about the optimization of your blog. I will suggest to use the following awesome plugin:
https://wordpress.org/plugins/autoptimize/
Thanks