I was also a Lyft driver for a few months and made less than $400. Do I need to file that?
No - you don't have to file your tax return if the part time job of $100 is your only wage income and Uber self-employment income is less than $400.
https://ttlc.intuit.com/replies/3302274
If you ARE required to file a return due to other income then you MUST report ALL your income on the return no matter how little.