sanft
soft
Feeling pleasantly soft and smooth to the touch; not rough or hard.
Die Babyhaut ist unglaublich sanft.
Baby skin is incredibly soft.

gentle / soft
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soft
Feeling pleasantly soft and smooth to the touch; not rough or hard.
Die Babyhaut ist unglaublich sanft.
Baby skin is incredibly soft.

The core meaning of 'sanft' (gentle/soft) is always the absence of hardness, strength, aggressiveness, or suddenness. This principle applies to all uses of the word.
Nach dem Streit suchte er nach einer sanften Lösung des Konflikts.
After the argument, he looked for a gentle solution to the conflict.
When referring to the feeling of touch, 'sanft' (soft) is often combined with nouns like 'Haut' (skin), 'Stoff' (fabric), 'Wolle' (wool), or 'Berührung' (touch).
Der Schal aus Seide fühlt sich sanft auf der Haut an.
The silk scarf feels soft on the skin.
To describe a person as calm and kind, 'sanft' (gentle) is often used with 'Stimme' (voice), 'Wesen' (nature), 'Art' (manner), or 'Lächeln' (smile).
Er ist ein sehr großer Mann, hat aber ein unglaublich sanftes Wesen.
He is a very large man, but he has an incredibly gentle nature.
To describe a slow, gradual change, people speak of 'sanfte Hügel' (gentle hills), a 'sanfter Anstieg' (gentle rise), a 'sanfte Landung' (gentle landing), or a 'sanfter Wind' (gentle wind).
Die Landschaft ist geprägt von sanften Hügeln und grünen Wiesen.
The landscape is characterized by gentle hills and green meadows.
When a method is described as mild and not aggressive, 'sanft' (gentle) fits. Typical combinations are 'sanfte Medizin' (gentle medicine), 'sanfte Reinigung' (gentle cleansing), or 'sanfter Tourismus' (sustainable/low-impact tourism).
Bei dieser Krankheit wird eine sanfte Therapie ohne starke Medikamente empfohlen.
For this illness, a gentle therapy without strong medication is recommended.
light / easy
'leicht' and 'sanft' can both describe something that is not strong or not intense. 'leicht' mainly emphasizes low strength or intensity, for example 'ein leichter Druck' (a light pressure) or 'eine leichte Bewegung' (a slight movement). 'sanft' often sounds friendlier and calmer: it describes a movement, treatment, or method that is careful, gentle, and without sudden harshness. If you only mean the strength, 'leicht' works well. If it is also about a pleasant, careful manner, 'sanft' is more natural.

Mit einer sanften Bewegung legte Maria das Baby ins Bett.
With a gentle movement, Maria laid the baby in bed.
Die Ärztin drückte leicht auf meinen Arm und fragte, ob es weh tut.
The doctor pressed lightly on my arm and asked whether it hurt.