stellen
to put
To bring something to a specific place in an upright position.
Kannst du bitte die Gläser in den Schrank stellen?
Can you please put the glasses in the cupboard?

to put / to set
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to put
To bring something to a specific place in an upright position.
Kannst du bitte die Gläser in den Schrank stellen?
Can you please put the glasses in the cupboard?

In its basic meaning, 'stellen' (to put) has a fixed sentence pattern: someone puts something (accusative) in/at a place (accusative). The place information is in the accusative because it describes movement toward a destination.
Ich stelle die Milch in den Kühlschrank.
I put the milk in the fridge.
The verb 'stellen' (to put/set) can be used reflexively ('sich stellen'). In this case, the meaning changes significantly. It can mean to surrender to an authority or to face a challenge.
Der Dieb hat sich am nächsten Tag der Polizei gestellt.
The thief turned himself in to the police the next day.
'Stellen' (to put/set) is the base verb for many important verbs with prefixes, such as bestellen, vorstellen, herstellen, or einstellen. If you recognize 'stellen', you can often work out the meaning of these more complex verbs more easily.
Können wir Pizza bestellen?
Can we order pizza?
The combination 'eine Frage stellen' (to ask a question) is a very common fixed expression. The person being asked is in the dative.
Darf ich Ihnen eine persönliche Frage stellen?
May I ask you a personal question?
When someone faces something (e.g., a fear, a problem), that thing is in the dative. The pattern is: sich + dative object + stellen.
Er muss sich endlich seiner Verantwortung stellen.
He finally has to face his responsibility.
In this meaning, 'stellen' (to set) is almost always used with devices that show or measure time. Typical combinations are 'den Wecker stellen' (to set the alarm), 'die Uhr stellen' (to set the clock/watch), or 'den Timer stellen' (to set the timer).
Hast du den Wecker auf 7:00 Uhr gestellt?
Did you set the alarm for 7:00?
The expression 'zur Verfügung stellen' (to provide / make available) has a fixed structure: someone (subject) provides someone (dative) with something (accusative).
Die Firma stellt ihren Mitarbeitern Laptops zur Verfügung.
The company provides its employees with laptops.
'Einen Antrag stellen' (to submit an application) is a fixed combination often used in bureaucratic contexts. You submit an application 'auf' something (accusative) or 'bei' an institution (dative).
Sie hat bei der Behörde einen Antrag auf Wohngeld gestellt.
She submitted an application for housing benefit to the authority.
This meaning of 'stellen' (to catch/confront) is found almost exclusively in contexts where someone is pursued and confronted, e.g., in crime novels or news reports about crimes.
Die Polizei konnte den flüchtigen Bankräuber nach kurzer Verfolgung stellen.
The police were able to catch the fleeing bank robber after a short chase.
The expression 'eine Diagnose stellen' (to make a diagnosis) belongs firmly to medical language. Only doctors or specialists can make a diagnosis.
Es war für die Ärztin nicht einfach, die richtige Diagnose zu stellen.
It was not easy for the doctor to make the correct diagnosis.
The expression 'etwas in Frage stellen' (to call something into question) means to doubt something. What is being doubted appears as an accusative object.
Einige Wissenschaftler stellen diese ganze Theorie in Frage.
Some scientists call this entire theory into question.
The verb 'sich verstellen' (to pretend / disguise oneself) is related to 'stellen' (to put/set). The inseparable prefix 'ver-' changes the meaning here to 'to act as if' or 'to feign'.
Er verstellte seine Stimme am Telefon, damit man ihn nicht erkennt.
He disguised his voice on the phone so that people would not recognize him.
to do
'tun' and 'stellen' can both mean that you put something in a place. The difference is important: 'stellen' is used when you put something in an upright position or onto a surface, for example a bottle on the table. In this meaning, 'tun' is very general and rather colloquial. For example, you can say 'Tu das Buch in die Tasche' (Put the book in the bag), but in many situations a more specific verb sounds better. Learners may confuse the words because both describe movement to a place. For upright objects, 'stellen' is usually more precise.

Er stellt die Wasserflasche neben seinen Laptop.
He puts the water bottle next to his laptop.
Tu die Bananen bitte in den Korb.
Please put the bananas in the basket.