üben
to practice
To perform an activity or skill repeatedly in order to learn or improve it.
Um ein Instrument zu meistern, muss man jeden Tag üben.
To master an instrument, you have to practice every day.

to practice
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to practice
To perform an activity or skill repeatedly in order to learn or improve it.
Um ein Instrument zu meistern, muss man jeden Tag üben.
To master an instrument, you have to practice every day.

The verb 'üben' (to practice) can either be used with an accusative object that describes what you are learning, or it can be used without an object.
Ich übe jeden Tag Gitarre.
I practice guitar every day.
In this meaning, 'üben' (to exercise/exert) is used with abstract nouns in fixed expressions. Typical phrases are 'Kritik üben' (to criticize / level criticism), 'Druck üben' (to exert pressure), or 'Rache üben' (to take revenge).
Die Journalisten übten scharfe Kritik an den neuen Gesetzen.
The journalists leveled sharp criticism at the new laws.
To express that you are making an effort to develop a quality, you use the reflexive construction 'sich üben in' (to practice / cultivate) followed by a noun in the dative.
Er ist sehr impulsiv und muss sich in Selbstbeherrschung üben.
He is very impulsive and has to practice self-control.
The use of 'üben' (to exercise/exert) with abstract nouns like 'Kritik' (criticism) or 'Druck' (pressure) is typical of formal written language and is used less often in everyday speech.
Der Verband übte erheblichen Druck auf die Politik aus.
The association exerted considerable pressure on policymakers.
to play
'spielen' and 'üben' can appear in similar situations with music, sports, or games. The difference lies in the goal. 'spielen' means that you are doing an activity, often for fun, according to rules, or in front of others. 'üben' means that you do something repeatedly in order to get better. Learners may confuse them because, for example, you can both 'Klavier spielen' (play the piano) and 'Klavier üben' (practice the piano). If the fun or the activity itself is important, 'spielen' fits. If learning and improvement are important, 'üben' fits.

Erik hat vor dem Vorspiel jeden Tag eine Stunde Klavier geübt.
Erik practiced piano for an hour every day before the recital.
Am Abend spielt Tom mit seinen Freunden Fußball im Park.
In the evening, Tom plays soccer with his friends in the park.