What Categories Should I Use To Categorize Coins?

Depends on how the collection is defined, but that sounds like a good selection. On my Birth Year Set, I also include its Krause number. On Morgan dollars, maybe include its VAM.

Now what if you don't remember every price paid because you purchased some years ago and didn't decide to catalog until a week ago XD.

Good choice.

Mine has Date, Mint, Variety (when necessary), Value, Date Acquired, Cost, Grade, Notes (usually where acquired).

Here are some previous threads for more opinions...

https://goccf.com/t/167164
https://goccf.com/t/89375

Also, consider a country column. Even if only doing US coins now, you may want to add those odd Canadians you find, or maybe include a foreign coin given to you by a friend/family member (anybody travel?), or at least it is a reminder that you can branch out to inexpensive coins by getting some cool-looking foreign coins.

Of course, you can always add a country column later, but then you won't have the reminder {grin}

how about metal content? 90% silver 40% silver cupronickel etc. what about mintages? might be hard if you are talking about errors or vaieties, but general mintage would be intersting.

also how are you cataloging your collection? you might want to add a number system for your own records, like album 1, or box 1 (you can define this as much as you want down to page, and position) so that you dont need to dig around years later to look for that one coin.

I am sure many of us have "lost" a coin only to find it months or years later when looking for something else.

For slabbed coins, I include the certification number for insurance purposes. (I also take pictures but those aren't in the spreadsheet, obviously.)

True, but I only collect major varieties (that which fills a Dansco hole). For example, I have noted the 1976 Eisenhower dollar varieties, large/small date Lincoln Cent varieties, etc. Since that column goes largely unused, I can be a bit more flexible as to what it contains.

I include description (including catalofue numbers), size, weight, year, cost, where and when attained, material, mintage number, grade, miscellaneous comments.

For ancient coins mintage numbers and grade aren't applied... for modern coins size and weight aren't unless its precious metal.

Just my personal preference.