leben
to live
To exist as a living being; to be alive.
Fische können ohne Wasser nicht leben.
Fish cannot live without water.

to live
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to live
To exist as a living being; to be alive.
Fische können ohne Wasser nicht leben.
Fish cannot live without water.

The verb 'leben' (to live) is the basis for the noun 'das Leben' (life) and the adjective 'lebendig' (alive/lively). If you know one of these words, you can understand the others more easily.
Er führt ein aufregendes Leben.
He leads an exciting life.
The meaning of 'leben' (to live) changes significantly with the following preposition. 'Leben in' (to live in) describes a place, 'leben von' (to live on) a financial source, and 'leben für' (to live for) a great passion.
Er lebt in einer kleinen Wohnung.
He lives in a small apartment.
When 'leben' (to live) describes a place of residence, it is typically used for larger geographical units such as cities, regions, or countries.
Ich würde gerne in Italien leben.
I would like to live in Italy.
The construction 'leben von' (to live on) + dative describes what someone uses to finance their livelihood or what they feed on. The source is always in the dative.
Als Student musste ich von sehr wenig Geld leben.
As a student, I had to live on very little money.
With the structure 'leben für' (to live for) + accusative, you express that something is the absolute center of a person's life. The object of passion is in the accusative.
Die Forscherin lebt für ihre Arbeit.
The researcher lives for her work.
To describe a particular way of life, 'leben' (to live) is often combined with adverbs or prepositional expressions.
Sie versuchen, sehr bewusst zu leben.
They try to live very consciously.
to earn / deserve
'leben' and 'verdienen' can both have to do with money and work, but they do not mean the same thing. 'verdienen' means to receive money for work. 'von etwas leben' means that this money or source is enough to support oneself. So you can earn a lot but still have an expensive lifestyle, or live on a small pension. Learners may confuse the words because in some languages the same expression is used for 'getting money' and 'living on it'. In German, ask: Is someone receiving money? Then use 'verdienen'. Is it enough to live on? Then use 'von etwas leben'.

Johanna lebt von ihrem kleinen Gehalt und muss genau auf ihr Geld achten.
Johanna lives on her small salary and has to watch her money carefully.
Am Wochenende verdient sie etwas Geld in einem Restaurant.
On weekends, she earns some money in a restaurant.