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- Welcome to Lesson 5: Composition.

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This is where we start focusing on design.

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At this point, we've learned
our language mechanics.

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We've learned out language symmetrics

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outside of concurrency.

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But this is where you're going to spend

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the bulk of your time as a Go developer.

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At least I hope so.

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Because composition is a huge

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and important part of writing software

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that won't be legacy code.

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We're going to learn how to design

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and build software from the
concrete up and decouple thing.

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And learn the mechanic
around these things as well.

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So this is an incredibly
important lesson for us to learn.

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Because this is the stuff
you're going to do every day.

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And I promise you that
when Go time is over,

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and it will be maybe in a decade or so

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and the next languages come out,

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it is this lesson that the aspect

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of composition the other languages

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are going to be copying from though.

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That's how important this lesson is.