Do you meal plan/prep for the week?

my dietican recommended that every week I plan out lunches/dinners for the week to help with overwhelm when it comes to meal times and general living expenses (im a student). Which got me thinking how many of us meal plan for the week and to what extent (ie just evening meals, all meals, lunches and dinners etc).

if you do meal plan/prep - what is your go to meal? This is just because im bored lol and need ideas :)