Looking for help learning on website project.

Hi, as a side-project I've been developing a small, not serious, website/webapp. I've made some solid progress, but I don't have any previous experience in this kind of topic and was wondering if anyone more experienced here could help answer some questions and point me in the right direction. If you do think you could help,  I would love to meet up and work with you if we could arrange a time. Some topics that are particularly troubling me are:

* Basic Blockchain / Authentication system

* Client-Server communication, PHP

* Javascript and HTML DOM and pages.

Thanks for reading.