why the maven is so annoying with spring-boot?

Recently I'm reading 'Pro Spring Boot 2: An authoritative guide to build...'

Basically I get errors for every chapter and every code demo.

And the spring boot, I can say that it really sucks when I deal with the dependency errors. I followed guidelines provided by offical spring boot documentation( Link: https://spring.io/guides/gs/spring-boot/ ), but the pom.xml just prompts error in my IDEA community edition.

Really speechless.

With python to develop web, things are not so annoying. Errors just keep showing..

What should I do?