How to do head voice without straining
Hello, I am new to the forum. I am a male singer and have been singing as a hobby for a while now but am trying to improve my technique and expand into some rock singing. Mainly classic rock style. My problem is I don't really understand what head voice is. I have have been watching a lot of the KTVA videos on youtube on the subject, and while I can hit the high notes using my diaphragm, I feel like there is still a lot of tension and I feel like there is a lump in my throat after doing it for a while. Is head voice kind of like when you are humming up high in a very low volume? The way you would scream if you were scared by something? Don't know how else to explain it. Any help would be greatly appreciated?