It's been a year or two since I've really dived into Oracle JET - Oracles open source toolkit for quickly developing web apps with it's modern Redwood UX. I started using it 5 maybe 6 years ago with version 4 and it's come a long way since then.
Checkout this video from Oracle GroundBreakers with me and the PM Team back in September 2019 to get a feel of what Oracle JET is and what makes it so good!
I was hoping that there would be a few sessions at CloudWorld this year - but alas it looks as if this year is targetted purely at Apps - although there are a few sessions that have been able to sneak through with VBCS.
Here is a sample custom CAPTCHA WebComponent I made 3 years ago with JET7 and I'm tempted to revamp this using Cloudflares turnstile and JET13..
If you are interested in learning about JET - I also have an Awesome Link List with lots of great resources to checkout.
But with that said the best 2 places to really dive in and get started