How to interact with camunda core classes

Hello all,
I am completely new to camunda.
I have a web application that would interact with camunda over rest api.
Now how can i make some custom apis in camunda and let my web application talk to it.
Whether i should install camunda as a spring-boot application ?
Thanks in advance.

It might be best if you spend some time understanding camunda by following the video tutorials or the get started guide. Then maybe you can refine your question a bit to be more specific

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Thanks @Niall
First of all happy new year
Sorted all previous pending stuff during last weekend.
Starting my journey with your videos tutorials.
Hope to see you more frequently during next coming months .