streichen
to paint
To cover a surface, especially a wall, with paint.
Am Wochenende wollen wir das Wohnzimmer gelb streichen.
At the weekend, we want to paint the living room yellow.

to paint / to cancel
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to paint
To cover a surface, especially a wall, with paint.
Am Wochenende wollen wir das Wohnzimmer gelb streichen.
At the weekend, we want to paint the living room yellow.

Normally, 'streichen' forms the perfect tense with 'haben'. One exception is the meaning 'umherziehen' (to roam): when an animal moves around, the perfect tense is formed with 'sein'.
Ich habe die Wand blau gestrichen.
I painted the wall blue.
Many meanings of 'streichen' share a common basic idea: a smooth movement over a surface. This idea connects painting a wall, spreading butter, and gently touching the skin.
Er strich die Farbe gleichmäßig auf die Leinwand.
He spread the paint evenly on the canvas.
In the meaning 'entfernen' (to remove) or 'annullieren' (to cancel), 'streichen' is often combined with plans, appointments, or lists. Typical phrases are: 'einen Flug streichen' (to cancel a flight), 'einen Termin streichen' (to cancel an appointment), or 'einen Namen von der Liste streichen' (to cross a name off the list).
Wegen Krankheit musste ich meinen Zahnarzttermin streichen.
Because of illness, I had to cancel my dentist appointment.
When something is canceled, the sentence is very often in the passive. The thing that is canceled is then the subject of the sentence.
Das Konzert wurde wegen des schlechten Wetters gestrichen.
The concert was canceled because of the bad weather.
When you gently touch someone, the person is in the dative. The preposition 'über' then introduces the body part or surface being touched.
Er strich seiner Freundin sanft über die Wange.
He gently stroked his girlfriend's cheek.
'Die Segel streichen' (to surrender / to give up) is a fixed idiom. It comes from seafaring and figuratively means that you give up a fight, a plan, or an undertaking.
Nach stundenlanger Diskussion strich er schließlich die Segel und stimmte zu.
After hours of discussion, he finally gave up and agreed.
to drive / ride
'über etwas fahren' and 'streichen' can both mean that a hand or an object moves over a surface. 'fahren' is more neutral here: it mainly describes the movement across a surface. 'streichen' sounds softer and often gentler or more affectionate, especially when you move your hand over hair, fur, or skin. The words can be confused because the movement is similar. If only the direction is important, 'fahren' fits; if the touch is gentle, 'streichen' fits better.

Die Ärztin streicht dem Kind beruhigend über den Arm.
The doctor soothingly strokes the child's arm.
Karim fährt mit dem Finger über die Karte und sucht den Weg.
Karim runs his finger over the map and looks for the route.