In English, we have the words "simple," "easy," "difficult," and "hard." German similarly has its own adjectives with nuanced meanings. You have likely seen einfach used both as an adjective most often meaning either "simple," "basic," or "easy," and also as an adverb meaning "simply," "basically," or "just." 

Im Grunde ist es also ganz einfach.

So basically it's quite simple.

Caption 34, Deutsch mit Eylin: Doppellaute

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Natürlich kann man auch einfach nur spazieren gehen.

Of course, one can also simply just go for a walk.

Caption 10, Berlin: Eva im Viktoriapark

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The adjective schwierig can also mean "tricky" more than truly hard or difficult. 

Und es ist schwierig, diese Dinge anzusprechen.

And it is difficult to talk about things.

Caption 37, Die Wohngemeinschaft: Probleme

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You may have noticed that the same adjectives used to describe weight apply to ease and difficulty. The adjective leicht  also means "light" (again, this is in terms of weight, not in terms of color, which would be hell). The adjective schwer has a whole host of meanings, including "heavy," "difficult," "severe," "grave," and "arduous." 

Sie bleiben gerne in der Deckung umgestürzter Bäume, wo sie der Hecht nicht so leicht erwischt.

They like to stay under the cover of fallen trees, where the pike can't catch them so easily.

Captions 17-18, Alpenseen: Kühle Schönheiten

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„Nichts leichter als das“, antwortete Frederick.

"Nothing easier than that!" answered Frederick.

Caption 4, Piggeldy und Frederick: Aufräumen

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Die können sich noch an andere schwere Zeiten erinnern.

They can still remember other difficult times.

Caption 11, Angela Merkel: Solidarität der Generationen in Coronakrise

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Clueso lässt sich immer noch schwer einordnen.

Clueso still remains difficult to categorize.

Caption 41, Clueso: ist endlich erwachsen

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Sie sehen als Erste die Kranken und wie schwer manche Verläufe der Infektion sind.

You are the first to see the sick and how severe some courses of the infection are.

Captions 6-7, Coronavirus: Fernsehansprache von Angela Merkel

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There's one more word that should be mentioned, which is the adjective simpel. Be careful: this word does mean "simple," but is also used negatively to express that something is simplistic or limited. 

Es ist eigentlich ganz simpel.

It is actually very simple.

Caption 34, Deutschkurs in Tübingen: Verben der 2. Kategorie

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Further Learning
When you see one of these adjectives in a sentence on Yabla German, ask yourself whether one of the others could be swapped in. Sometimes something will be either leicht, einfach, or simpel, but not all three, and the same goes for schwierig and schwer.