To use google excel or notion?

Airtable

I think it depends on how intense you want to track your finances. I have seen people track it like a balance sheet and yes, Google Sheets does the job well. Otherwise, there are a lot of templates on the Notion gallery that you can find one that fits your needs.

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As for storing passwords, I would suggest Bitwarden. It's an open-source password manager that is as good as Lastpass/OnePass.

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Overall, Notion for me to keep everything else except my passwords.