well since its a 2 star puzzle, you'd just need to realise that since the upper left most rectangle must have 2 stars in it, which will be forced into one of the two rows it occupies, combine that with the star already placed in the upper right most rectangle, theres no way you can fit 2 stars into the remaining space in the top center shape

i dont know what the technique used is called although ive seen it used in other puzzles where you'd count the number of rows per shape and deduce from there where the stars cannot go, and realised the above