reichen
to hand
To give something to someone with your hand, often over a short distance.
Könntest du mir bitte das Salz reichen?
Could you please hand me the salt?

to hand / to suffice
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to hand
To give something to someone with your hand, often over a short distance.
Könntest du mir bitte das Salz reichen?
Could you please hand me the salt?

The sentence structure helps distinguish the meanings. A dative person points to 'geben' (to give), the preposition 'für' (for) to 'genug sein' (to be enough), and 'bis' (to / until) to 'sich erstrecken' (to extend).
Reich mir bitte den Zucker.
Please hand me the sugar.
In the meaning 'geben' (to give), the person receiving something is always in the dative. The object being given is in the accusative.
Der Kellner reichte uns die Speisekarte.
The waiter handed us the menu.
To express what something is enough for, the preposition 'für' (for) followed by the accusative is used. However, the verb can also stand without a complement.
Meine Energie reicht heute nicht mehr für Sport.
My energy no longer suffices for sports today.
To describe the extent or range of something, 'reichen' (to reach) is often used with the preposition 'bis' (to / until) or the combination 'von ... bis' (from ... to).
Der Wald reicht bis an den Fluss.
The forest reaches all the way to the river.
The expression 'Es reicht!' (That’s enough!) is an emotional exclamation that expresses impatience or anger. It means something like 'Stop it!' or 'I’ve had enough!'.
Ruhe jetzt, es reicht! Ich möchte schlafen.
Quiet now, that’s enough! I want to sleep.
to give
'geben' and 'reichen' can both mean that one person gives something to another person by hand. 'geben' is more general and mainly says that something comes to another person. 'reichen' is used especially when the other person needs something at that moment and you hand it to them over a short distance. It often sounds a bit more concrete and polite in a direct situation. Learners may confuse the words because the action is similar. If only the transfer is important, 'geben' fits; if the movement by hand toward someone is emphasized, 'reichen' is a better fit.

Nach dem Unterricht reicht Alina ihrer Freundin die Jacke vom Stuhl.
After class, Alina hands her friend the jacket from the chair.
Aylin gibt ihrem Bruder in der Pause den Hammer.
Aylin gives her brother the hammer during the break.