You can learn about joining relational data here : 13 Relational data | R for Data Science (had.co.nz)
about your rename issue; its clear from the error that Q2 is a mere list, and not one that is a data.frame which is what rename is designed to operate on.
Here is a link to our reprex guide for if you want to provide examples of your start data.
A minimal reproducible example consists of the following items:
A minimal dataset, necessary to reproduce the issue
The minimal runnable code necessary to reproduce the issue, which can be run
on the given dataset, and including the necessary information on the used packages.
Let's quickly go over each one of these with examples:
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