Learning Cuba-Platform

I am influenced by Cuba-Platform and planning to learn enough to develop a solution for Enterprise.
Appreciate if some one could answer my queries:
(1) Do we need to pay for Java license for running Cuba-Platform applications?
(2) Resources for learning Cuba-Platform from scratch to master

(1) Do we need to pay for Java license for running Cuba-Platform applications?

If you use OpenSource Java builds, you do not need to pay for Java license or support, for instance, from vendors: AdoptOpenJDK, Amazon Corretto, Liberica JDK

See:

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https://www.cuba-platform.com/learn/
https://www.haulmont.com/services/cuba-platform-services/training/

Here is a cool blog from one of our community members:

Covers many topics from the external point of view.