Minors people forget about

I have my test soon and my instructor has not been great at telling me what things i do would be minors and majors. He just tells me to correct them but things are unclear.

So far, I've found out that my need to slow down moving off and turning corners is actually a NECESSITY to avoid minors there. What else has caught people out in the past?

I also struggle to know what is allowed in some situations as I'm used to watching my dad drive, who usually does many technically illegal things.