der Kamm
comb
An object with a row of teeth or prongs used to arrange, detangle, or style hair.
Hast du einen Kamm für mich? Meine Haare sind vom Wind ganz zerzaust.
Do you have a comb for me? My hair is completely tousled from the wind.

comb / ridge / crest
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comb
An object with a row of teeth or prongs used to arrange, detangle, or style hair.
Hast du einen Kamm für mich? Meine Haare sind vom Wind ganz zerzaust.
Do you have a comb for me? My hair is completely tousled from the wind.

All meanings of 'Kamm' (comb / ridge / crest) describe a structure with a narrow, often jagged or raised upper edge. Whether with hair, mountains, waves, or animals, the shape is the connecting idea.
Vom Kamm des Gebirges hatten wir eine fantastische Aussicht.
From the ridge of the mountain range, we had a fantastic view.
The idiom 'alle über einen Kamm scheren' means to treat all people or things the same and not make distinctions, often in a negative, unfair sense.
Man kann nicht alle Politiker über einen Kamm scheren, es gibt auch engagierte Leute.
You can't tar all politicians with the same brush; there are also dedicated people.
The verb that goes with the noun 'der Kamm' (the comb) is 'kämmen' (to comb). It is usually used reflexively: 'sich (die Haare) kämmen' (to comb one's hair).
Ich muss mir noch schnell die Haare kämmen, bevor wir gehen.
I still have to quickly comb my hair before we go.
In the meaning 'Bergrücken' (mountain ridge), the preposition 'auf' is almost always used. You hike 'auf dem Kamm' (on the ridge, position) or climb 'auf den Kamm' (onto the ridge, direction).
Die Wanderung auf dem Kamm war anstrengend, aber wunderschön.
The hike on the ridge was exhausting but beautiful.
summit / peak
'der Gipfel' and 'der Kamm' can both belong to mountains. 'der Gipfel' is the highest point of a single mountain. 'der Kamm', on the other hand, is a long, often narrow upper line of a mountain or mountain range. The words can be confused because both are high up on a mountain. If you mean the one highest point, say 'Gipfel'. If you mean the line or ridge along the top, say 'Kamm'.

Auf dem Kamm wehte ein starker Wind.
A strong wind was blowing on the ridge.
Nach drei Stunden erreichten wir endlich den Gipfel.
After three hours, we finally reached the peak.