Responsive multistep for using html css and javascript

What did you find difficult while building the project? This code took me 2week to complete I learnt a lot of things... what I found difficult was trying to make my code very understandable for both me reviewers so I have to look for a better way to write form validations

I also had to go and practise more on by javascript object and carry methods before I continued it... i was using tailwind CSS at first then I hit a rode block when my form way not responsive at medium size I had to switch back to vanilla CSS but this time I use scss for better formatting

Which areas of your code are you unsure of? No check box in any step are checked by default

Which areas of your code are you unsure of? Please check and give me feedback