[8th-7th grade geometry] i got this question right but i got solving for like a fully equal triangle wrong + the top part. why’s that?

ok tbh i never understood which angles/sides i have to use depending on the situations i just guessed but my monthly test which will determine my grade for this first half of the semester is coming up and i think i should know it bc it’s too risky to just guess . does SAS work too? how do i know which rules can work and which can not ? i just remember a bit of like what my teacher said once while correcting our hw someone else didn’t know this and she said “the sides are not pinching the angle so you can’t use this” but idk what that means i was so sleepy that entire class and now i know nothing .

soo vv simple : how do i know which rule to use depending on the situation?

ok tbh i never understood which angles/sides i have to use depending on the situations i just guessed but my monthly test which will determine my grade for this first half of the semester is coming up and i think i should know it bc it’s too risky to just guess . does SAS work too? how do i know which rules can work and which can not ? i just remember a bit of like what my teacher said once while correcting our hw someone else didn’t know this and she said “the sides are not pinching the angle so you can’t use this” but idk what that means i was so sleepy that entire class and now i know nothing .

soo vv simple : how do i know which rule to use depending on the situation?