I bought my watch second hand , I didn’t know the watch would be a activation lock, now I can’t get passed activation lock because I don’t know the previous Apple ID and password, what can I do? is it garbage

The person that you bought this watch from needs to follow all the steps in this link;

Remove the Activation Lock so that the buyer can use it.

If they can't or won't then get your money back or recycle the watch and put it down to experience.

I bought a 2nd hand iPhone 6 from a guy and I didn't know it had activation lock on it and I cant passed the activation lock I don't know the previous apple id and password what to do