The lens collocation of entry-level SLR 550D portrait photography?

The focal length of a classic portrait is 35,50,85,135,200.

35 F2 and 50 1.8 are the most suitable portraits for buyers in frame C, and 35 is the best companion and the most suitable portrait for focusing. 50 1.8 is extremely cheap and worth starting with. So these two fixed-focus lenses should be your first choice.

24 and 28 are wide-angle fixed focus, which has no advantage over the above two lenses and can be ignored for the time being.

In the future, you can choose 18- 135, 15-85, 24- 105, 24-70, 70-200, and arrange them from bad to good.