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My old boss showed me 3 workbooks his last day of work. I now have his job and spend a good amount of time in those workbooks. Google was my friend.
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Anytime I take over someone's job (and I do that a lot more frequently than I'd like) I generally set as my first task the purging of their tools and crutches, Excel workbooks are priority ONE.
If you're using Excel as a standalone application, you're doing it wrong. Oh, you can do it, but it'll never be "correct" and it will always be vastly more fragile and more difficult work.
Excel is the "answer" that virtually everyone with a passing familiarity with computers migrates to. It's almost *always* the wrong answer.
There are COTS packages that do what you want Excel to do and do it properly, with scalability. You can hire a dev to write you an application to do *precisely* what you want to do, probably a LOT cheaper than you think.
Please, stop bending a spreadsheet program into a hybrid/bastard database, calendar, inventory, accounting, reporting, invoicing, tax and HR tool.
That's not what Excel is for. Oh, it *can* do all that shit but, it *shouldn't* be doing any of it.
I say this as a guy who has, long ago, mastered the program.
For the OP, the best way to learn how to use an application as wide and deep as Excel is to start having problems and work toward solving them with the application. You're never going to get far trying to do it by rote memorization of the, literally, millions of ways of doing "stuff."