Your reply to “yeah” will depend on the context that which “yeah” is used. If the context is an answer to a Yes/No question then you can say something like “ok” or “great”.
Have you taken out the trash yet?
Uses of Yeah and how to respond
Your reply to yeah will depend on the context that which “yeah” is used.
Yeah as an agreement
When “yeah” is used to simply agree with something, your reply can be anything really. You can decide to change the topic or continue with the same topic.
My football team is the best.
They won the game last night 5-0.
Yeah as an answer to a Yes/No Question
You can reply to “yeah” that answers a yes/no question with “ok” or “good”
Did you clean the garage?
Ok great, Now clean your room.
Yeah as an exclamation
Sometimes we use “yeah” as an exclamation when something good happens. You can reply to this “yeah” with “good job” or “well done”.