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I am in grade 12 and am having difficulty in Math, especially in spatial geometry.

Specifically, I am having problems determining the angle between two planes and calculating the distance between two intersecting lines. I have tried:

Reviewing the definitions and formulas in the textbook.

Solving sample exercises in the workbook.

Watching instructional videos on YouTube.

However, I still do not understand clearly how to apply the formulas and theorems to specific exercises. I often get confused between the steps and do not know how to draw the correct illustrations.

I really hope to receive help from everyone. I would like to ask:

Does anyone have experience studying spatial geometry well?

Are there any effective methods to determine angles and calculate distances in space waves ? 

Are there any useful reference materials or lecture videos on this part?

Can anyone share tips on drawing illustrations for spatial geometry exercises?

I can spend about 2 hours a day studying Math. I am using the Math 12 textbook of the Ministry of Education and Training.