Questions about Excess Contributions and Form 5329

I made excess contributions to a Roth IRA in 2021, 2022, 2023 and 2024.

 

I got in touch with Vanguard and had the excesses removed in March along with the NIA from 2024.

 

I'm working on filling out 5329s for each of those years but I'm confused about the instructions for Lines 1 and 2. I've read through the instructions but I'm not confident that I understand what they want for my scenario.

 

I guess my questions are these:

-- Line 1 in form 5329 appears to be only the gains I received on the excess contributions I made in 2024. Is that correct?

-- Do I put anything on Line 2 in Form 5329?

-- Do I need to fill out Form 8606 for any or all of the years?

 

Grateful for any input.