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Read the slides "Crafting beautiful software". Take notes on terminology, and where these things appear on the blue Hexagon. https://www.slideshare.net/JornOomen/crafting-beautiful-software
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Google search topic on the terminologies. (example: php, explain command bus) - Also, do a google image search on terminologies too.
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Read about "Hexagonal Architecture - message-oriented software design" from PHPCon Poland 2015