'Form-builder using spring boot + thymeleaf + webjars bootstrap

I'm building a project using spring boot and thymeleaf and I have no idea how to create a task with thymeleaf and spring boot. The project looks something like this https://frontbackend.com/spring-boot/react-drag-drop-taskboard-spring-boot-2-postgresql

Want to build this with only thymeleaf and spring boot.

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