streicheln
to stroke / pet
To move one's hand gently and affectionately over the surface of someone or something, especially an animal.
Das Kind liebt es, den Hund zu streicheln.
The child loves to pet the dog.

to stroke / pet
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to stroke / pet
To move one's hand gently and affectionately over the surface of someone or something, especially an animal.
Das Kind liebt es, den Hund zu streicheln.
The child loves to pet the dog.

'Streicheln' (to stroke/pet) is a diminutive form of 'streichen' (to stroke/brush). It describes a gentler, often repeated, and more affectionate touch than the neutral 'streichen'.
Sie streichelte sanft über den Stoff des Kleides.
She gently stroked the fabric of the dress.
There are two typical sentence patterns. Either you directly stroke the object (accusative), or you stroke over a body part (accusative) of a person (dative).
Er streichelt seine Katze.
He pets his cat.
When 'streicheln' (to caress) is used in connection with natural phenomena like wind or sun, it has a poetic or literary effect. It describes a very gentle touch.
Die Abendsonne streichelte die Berggipfel.
The evening sun caressed the mountain peaks.
The reflexive construction 'sich gestreichelt fühlen' (to feel flattered) means that one feels flattered by praise or recognition. The cause is often introduced with 'durch' (through/by).
Durch das positive Feedback fühlte sie sich sichtlich gestreichelt.
Because of the positive feedback, she visibly felt flattered.
to hit / beat
'schlagen' and 'streicheln' both describe touching with the hand, but they are clear opposites. 'schlagen' is hard, quick, and violent. 'streicheln' is gentle, slow, and usually affectionate. 'Schlagen' hurts or can cause fear; 'streicheln' is meant to calm someone or show affection. So the difference is mainly in the kind of touch and the intention.

Sie streichelt den Hund, damit er ruhig bleibt.
She pets the dog so that it stays calm.
Er schlug mit der Hand gegen die Wand.
He hit the wall with his hand.