Based on: legen
A quick look at the meaning of "nachdenken", the difference to just "denken" and how to use this verb in everyday German.
A fun look at the meaning of "überlegen", the surprising logic behind the meaning and the difference to "nachdenken".
A fun look at the meaning of "die Wahl" and the verb "wählen" and the difference to "aussuchen". And a boring look at the German political system :).
die Wahl, wählen, wählerisch, die Auswahl
The core idea of this root was:
laying, lying down
of course the verbs to lay and to lie belong here, but the root is also the origin of law, lair, ledger, allay and low. And of lager, which is essentially a German word that means storage.