What to do with WEP Key after coecting?

I've used aircrack-ng to brute force a wifi network and find out the key. I've also coected to the network. What next can I do to conduct my investigations? PS I'm not doing anything illegal--I'm a cybersecurity student in a camp performing a penetration test on a made up company.

I've heard some stuff of using the key to decode the packets I've captured, but how do I go about doing this? Thanks.

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