it seems that everything should be a Purchase (Spend) or a Sale (Receive),
No, you can do both, a Spend or Receive, without it being a Purchase or Sale.
When you do a Capital Contribution it is a Receive Money
When I use a Journal Entry, then I have a Debit and Credit side, which I do not have in Cash Accounts.
In Cash Accounts you do have Debit and Credit, it is just displayed differently.
When you select Receive Money that is the same as saying Debit and when you nominate the Account that is the same as saying Credit. When you select Spend Money that is the same as saying Credit and when you nominate the Account that is the same as saying Debit.
you have other things as well, which should be added as Journal Entries
Yes, but not if those other things involve the movement of money. Please re-read my last post - how does the Bank put Journals on to the Bank Statement What communicates to the Bank that the Journal exists,
there are currently some things that I do not understand and I have to figure them out in order to use the software correctly
Correct
I currently have only a Cash Account, because I could not add a Bank Account.
Currently you have a Cash Account and a Bank Account with both listed under the Cash Accounts tab (heading). If you wanted to a have a Credit Card Account, then it would be listed under the Cash Accounts tab. Bookkeeping services for small business firm Your Books On Time.
I definitely would have liked to use my Custom Accounts everywhere
Well, you can’t
there are some default accounts which have to be used, but they work in one place, but do not work in other places.
All default accounts work where they are required to work within the rules of accounting. They are not going to work where that would breach the rules of accounting.
When I first created my Bank and Cash account separately, then I could use them in my Journal correctly.
Perhaps, but that was a completely WRONG usage
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