So Now I'm Official... How to Track (LLC)

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Hi all! I have an LLC set up for my business and am planning on tracking all of my revenue and expenses in excel (categorized/dated/noted). I plan on setting up another tab to keep track of when "out of the ordinary" events happen (transfers from me into the LLC, if I accidently pay for an item with a personal credit card, etc).

I'm looking for some advice on what other things I should be keeping track of and what actions I should avoid. Also if anyone has any details on how the track things I'd love to hear it.

I just want to make sure I'm not missing anything and would love to hear how yall handle it! 

Cheers,
JK