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Java

H2 server/database over Wildlfy/MySql use case?

Hi,

I've been exposed to MySql/Wildfly and Tomcat, but not yet the one being shown throughout these Java tutorials; Now, this makes me confused on what technologies to use in real-life situations.

Based on what I've seen, is H2 server/database used for smaller applications whereas the other technologies mentioned above for larger scale applications? With all these different options, what technologies should be a beginner focus on for deploying real-world applications? I ask, because there are not many postings asking for Spark, or H2 experience ...