1, you should learn to see the two triangles you want to prove. Find the corresponding edges, corners and vertices. You can imagine a triangle as another rotating or translating.

2, learn to use what you have learned to prove, don't just remember ASA, SAS, AAS, SSS, HL. They are usually the last step. For example, if the topic gives you an angle bisector, you can get that an angle and an edge are equal. One reason is the common edge, and the other reason is the definition of the angular bisector.

3, if necessary, you can add auxiliary lines, be sure to memorize concepts and understand the meaning of angles and edges.

4. You may not be happy after reading the rest, but you have done too much. Except for congruent triangles, I don't recommend using the sea-questioning tactics for other geometries, because there are many concepts. Therefore, after proficiency, the answer will be faster than others, which is what I feel. Master basic concepts and cultivate sensitivity to mathematical graphics.

Okay, I've said everything I need to say. If you want to find an example, I advise you to thoroughly understand the classic questions and basic training in the book and work hard step by step to get home. Wish you success!