So doing things onchain is a great way to build reputation but also do everything with a burner wallet, do I have that right?

Builder of software and songs. 

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I counsel our clients to have a wallet they only ever connect to our partner dapp, one they receive our dunds in and just use it to transfer, and one or more they keep lean that they use to connect to most everything else.

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Dad bod.  Bulldogs.  Trophy husband.

So how does that reconcile with onchain reputation if I’m most actions are on the lean wallet? And which wallet would you recommend linking to end and Farcaster?

It’s only affecting reputation if reputation is based on the amount your wallet is holding.  Transactionally you’re still doing everything with your lean wallet but your bulk of funds are held on a hot wallet you haven’t exposed your keys to any dapps.  Want to use funds, just transfer to your lean wallet.