labern
to ramble
Colloquial and often derogatory for talking at length in an empty or stupid way; to chatter without getting to the point.
Hör auf zu labern und hilf mir lieber bei der Arbeit!
Stop rambling and help me with the work instead!

to ramble
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to ramble
Colloquial and often derogatory for talking at length in an empty or stupid way; to chatter without getting to the point.
Hör auf zu labern und hilf mir lieber bei der Arbeit!
Stop rambling and help me with the work instead!

'Labern' (to ramble) is a colloquial word and has a clearly negative or derogatory meaning. It expresses that you consider someone's talk unimportant, boring, or stupid. Use it only in informal situations.
Er hat die ganze Zeit nur über das Wetter gelabert.
He just rambled on about the weather the whole time.
A very common fixed phrase is 'jemanden volllabern' (to talk someone's ear off). It means to talk at someone nonstop, often about unimportant things, so that it bothers the other person.
Laber mich nicht voll, ich muss mich konzentrieren!
Don't talk my ear off, I need to concentrate!
You can simply use 'labern' (to ramble) on its own, without an object, or you can use the preposition 'über' (about) plus the accusative to say what someone is talking about. Both are very common.
Die beiden saßen auf der Bank und haben einfach nur gelabert.
The two of them sat on the bench and just rambled.
to talk
'reden' and 'labern' both have to do with spoken language. 'reden' is neutral and fits almost all situations when people are speaking or talking about a topic. 'labern' is colloquial and often negative. It is used when someone talks for too long, without clear content, or in an annoying way. The words can be confused because they describe a similar action. But 'labern' can quickly sound rude. If you want to stay neutral, 'reden' is safer.

Im Bus hat ein Mann die ganze Zeit gelabert und niemand konnte lesen.
On the bus, a man rambled on the whole time, and no one could read.
Nach der Arbeit reden wir über das Geld für den Kurs.
After work, we talk about the money for the course.