Introduction
A transaction is nothing more then moving a resource (money or credit) from one place to another. When you pay a taxi for a ride, the amount of money that goes from your wallet to the driver represents a transaction.
This real life transaction, in Bkper, is represented by an Amount that goes from an Origin Account to a Destination Account. Where the Origin Account represents your wallet or cash and the Taxi driver is the Destination Account. The amount on the transaction is the quantity of money that you paid for the ride.
The video How the economy works by Ray Dalio from Bridgewater Associates explains Transactions in a broader context.
Post your first Transaction on Bkper
The steps are:
1 Record a draft
2 Complete the draft & Post the Transaction.
1 Record a Draft
Write in natural language "Taxi 25" into the input field on your book and press the red record button.
Great, you have Recorded a Draft entry in your book!
Bkper interpreted the number 25 as the amount of the transaction and the question marks on the draft indicate that Bkper does not yet understand what the From and To Accounts are for the "Taxi" entry.
2 Complete the Draft & Post the Transaction
Click the red Edit button 
on the left in the draft.
The Input form opens to edit or add additional data to your entries. The first time you use a description, you have to help the Bkper Bookbot understand its meaning and Complete the transaction. On an empty book this means you have to Create the From and To Accounts.
Click on the From Account question mark and write "Cash", following that click elsewhere In the form.
Select the Asset type and press the Create button.
Repeat these steps for the To Account, to create an Outgoing "Transport" Account.
Press the green Post button once you complete the form.
Great, you have Posted your first Transaction on Bkper.
The Accounts and their Balance values are now listed on the Left menu.
Note how the Cash and Transport accounts tally zero.
Repeat these steps with the input "Taxi 30"
Bkper now understands the meaning of "Taxi" and Completed the From and To Account for you on the Draft.
Post this draft by pressing the green Post button 
on the left in the draft.
The Balance Values on the left menu are updated at each posted transaction.
Notes
The double entries in Bkper always sum all Debits and Credits to zero.
Though this is a cash example Bkper manages the accrual method in the same manner.
Drafts do not change balance values.
Posted transactions change Balance values.
Colors represent account types: Asset, Liability, Incoming and Outgoing.
The Bkper Bookbot learns in one or two transactions how to complete the from and to accounts.
2 minute video tutorial Record your first Transaction