MiniExtensions used to be great back in 2020, but it has gone downhill since then.
Currently, the best portal & form tools for Airtable are:
Fillout, Noloco, Softr, JetAdmin, and Glide
I give a step-by-step tutorial of Noloco on this episode of the BuiltOnAir podcast.
p.s. If you have a budget for your project and you’d like to hire an expert Airtable consultant to help you with any of this, please feel free to contact me through my website: Airtable consulting — ScottWorld
I am a user of Mini Extensions and out of the box was up and running with a very good airtable front end in hours. Yes there are other solutions out there that look prettier and have a lot more enterprise features/visuals, but they also cost a bomb. Mini Estensions does the trick