Find a useful starting point, practise it, and return to more advanced work as your understanding grows.
The core idea
Start with screen acting basics, listening, objectives, and scene circumstances. These subjects help connect behaviour to what is happening instead of displaying an emotion without a reason.
How to apply it
Move into character preparation, script analysis, subtext, and turning points. Then explore audition preparation and self-tape performance, always giving the actual casting instructions priority.
Try this next
Choose one lesson, write down what you will test, practise it more than once, and review the result. Reading many lessons without applying one may be less helpful than focused practice.