A Computer for online learning

Hi my name is Heaven. I’m an 9th grader who recently graduated from 8th grade as 2nd highest. My first quarter of high-school, which was online, I achieved all A’s and 1 B. I really wanted to invest into a good laptop for school that can also last till college and I am so close to my goal. I have saved up a lot of money and if it was not for my legal age I would get a job and pay the rest off my self but unfortunately I can’t. Any thing will help I am grateful.