The German verb bauen means "to build" or "to contruct" and is generally used for physical structures, though not exclusively. 

Ihre Kugelnester baut sie gern auf halber Höhe über dem Wasser.

It likes to build its spherical nests halfway up above the water.

Caption 36, Die letzten Paradiese: Die Schönheit der Alpen 1

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Verbs that consist of bauen and a prefix follow a similar pattern. The verb aufbauen, for example, can refer to setting something up, but also restructuring something. Note the phrase neu aufbauen as well, as this means "to restructure" or "to reestablish."

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Alles hängt zusammen und muss verbessert oder gar ganz neu aufgebaut werden.

Everything is connected and must be improved or even completely rebuilt.

Caption 15, 30 Jahre: Menschen für Menschen

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Emma würde sehr gerne mit ihren Freunden nächste Woche auf dem Kirchenbasar einen Flohmarktstand aufbauen.

Emma would very much like to set up a flea market stand with her friends at the church bazaar next week.

Captions 41-42, Die Pfefferkörner: Endspurt

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When a building is renovated or something is physically converted or modified, the verb umbauen is often used: 

Damit der A dreihundertachtzig überhaupt in Frankfurt landen kann, musste die Fraport AG so einiges umbauen.

In order for the A three hundred and eighty to even be able to land in Frankfurt, Fraport AG had to rebuild quite a few things.

Captions 38-39, Rund um den Flughafen: Der neue Airbus A-380

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The verb einbauen is generally translated as "to install":

Ne, wenn man hier Magnete einbauen würde, so dass das Dodomobil leicht über dem Boden schwebt, dann wäre da keine Reibung.

Right, if you were to install magnets here, so that the Dodomobile gently floats above the ground, then there would be no friction.

Captions 69-71, Das 1. Newtonsche Gesetz: erklärt am Beispiel des Dodomobils

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The verb nachbauen has the connotation of copying something:

Das sind Menschen, die einfach das Original im Kleinen nachbauen möchten.

These are people who simply would like to reconstruct the original on a small scale.

Caption 5, Modelleisenbahner: Mehr als nur ein Hobby

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The verb anbauen refers to agriculture and the act of planting, growing, or cultivating. 

Außerdem sollen Lebensmittel ökologisch angebaut werden.

In addition, food should be organically grown.

Caption 25, Erklärvideos: Nachhaltigkeit einfach erklärt

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And finally, the verb abbauen means to dismantle, dissolved, or reduce. When something is biologisch abbaubar, it means it's biodegradable. 

Das ist auch hundert Prozent ökologisch abbaubar.

That's also one hundred percent biodegradable.

Caption 26, Lerchenberg: Du bist, was du isst

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Further Learning
Try to create your own sentences with these verbs, or look for additional examples on Yabla German.

Not too long ago, we sent out a lesson on homographs, which are words that are spelled the same and sound the same, but have different meanings. You could also say that it's when one word has various definitions. Anyway, the noun der Gang falls into this category.

One translation of der Gang is "the course," as in a course of events, or the way something happens.

Hier geht alles seinen ruhigen Gang.

Here, everything runs its quiet course.

Caption 21, Die letzten Paradiese - Die Schönheit der Alpen - Part 9

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Just as a course can also refer to part of a meal in English, Germans say der erste Gang for the first course (though probably more often die Vorspeise / "the appetizer") and der Hauptgang for the main course.

Und da kommt auch schon der nächste Gang.

And here comes the next course already.

Caption 18, Die letzten Paradiese - Die Schönheit der Alpen - Part 5

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Now it's time to shift into high gear, for which we can also use der Gang, as it is used to refer to a gear that you would shift into on a bicycle or in a car. Unlike in English, it does NOT refer to a gear in a wristwatch, which is das Zahnrad (die Zahnräder as a plural noun).

Dann legen wir den ersten Gang ein.

Then we shift into first gear.

Caption 17, Fahrschule - Wie man die Kupplung bedient

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Here you can see how der Gang is used to refer to someone's gait or the act of doing a walkthrough.

Es gibt ja viele Frauen, die...

There are many women that....

ja, ihren Gang auch ein bisschen verbessern können.

yes, can also improve their walk a little bit.

Caption 15, Auf dem Laufsteg - Modelcollege in Wiesbaden

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... deshalb schwingt bei einem Gang durch das Museum auch viel Nostalgie mit.

... therefore a tour through the museum also resonates with a lot of nostalgia.

Caption 23, Flipperautomaten - Kunstwerke für flinke Kugeln

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And then there's the very common translation of der Gang as a hallway or corridor:

Der rechte Gang und dann ganz hinten links.

The right hallway and then all the way in the back on the left.

Caption 18, Mein Weg nach Deutschland - Auf Arbeitssuche

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Further Learning
You'll find many instances of der Gang used on Yabla German, but why not also try to formulate your own sentences?