treten
to step
To put a foot on something or move it in a certain direction.
Vorsicht, tritt nicht in die Pfütze!
Careful, don't step in the puddle!

to step / kick
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to step
To put a foot on something or move it in a certain direction.
Vorsicht, tritt nicht in die Pfütze!
Careful, don't step in the puddle!

The perfect tense of 'treten' (to step/kick) is formed with 'sein' when it describes movement to a place. It is formed with 'haben' when it describes an action or a kick without a change of location.
Er ist mir aus Versehen auf den Fuß getreten.
He accidentally stepped on my foot.
When 'treten' (to step) means movement, it is usually followed by a preposition with the accusative that indicates direction. Common prepositions are 'in' (into), 'auf' (onto), 'an' (to/up to), or 'vor' (in front of).
Der Redner trat ans Pult.
The speaker stepped up to the lectern.
In the meaning 'stoßen' (to hit/bump), 'treten' (to kick) can either have a direct accusative object or be used with the preposition 'gegen' + accusative (against).
Er hat den Ball mit voller Kraft getreten.
He kicked the ball with full force.
The phrase 'in Kraft treten' (to come into force) is a fixed unit and is used in legal language. The subject is always a law, regulation, or rule.
Die neue Datenschutzverordnung ist letztes Jahr in Kraft getreten.
The new data protection regulation came into force last year.
In the idiom 'jemandem zu nahe treten' (to offend someone), the person whose feelings are hurt is always in the dative. The expression indicates that someone has unintentionally offended someone.
Entschuldigung, ich wollte Ihnen mit dieser Frage nicht zu nahe treten.
Sorry, I didn't mean to offend you with this question.
In the expression 'zutage treten' (to come to light), 'zutage' behaves like a separable prefix. In a main clause it stands at the end; in a subordinate clause it stands together with the verb.
Erst nach Jahren traten die wahren Motive zutage.
Only after years did the true motives come to light.
The expression 'auf der Stelle treten' (to make no progress) is often used figuratively. It means that you are not making progress in a situation or on a project.
Wir diskutieren seit Stunden, aber treten bei diesem Thema auf der Stelle.
We have been discussing for hours, but we are making no progress on this topic.
to apply / be valid
'gelten' and 'in Kraft treten' both have to do with rules, laws, or regulations. 'gelten' describes that a rule is already valid or in effect. 'in Kraft treten' describes the moment from which a rule becomes valid. Learners may therefore confuse the words when talking about laws. Memory tip: A rule 'tritt an einem bestimmten Tag in Kraft' (comes into force on a certain day); after that, it 'gilt' (is valid / applies).

Das neue Gesetz tritt am ersten Januar in Kraft.
The new law comes into force on January first.
Ab morgen gelten im Büro neue Arbeitszeiten.
Starting tomorrow, new working hours apply in the office.