QuickBooks is a line of business accounting software developed and marketed by Intuit. wikipedia.org

Generally Accepted Accounting Principles (GAAP) refer to the standard framework of guidelines for financial accounting used in any given jurisdiction; generally known as accounting standards. wikipedia.org

Tax preparation is the process of preparing tax returns, often income tax returns, often for a person other than the taxpayer, and generally for compensation. Tax preparation may be done by the taxpayer with or without the help of tax preparation software and online services. wikipedia.org

Reconciliation is the process of ensuring that two sets of records (usually the balances of two accounts) are in agreement. wikipedia.org

A Bank reconciliation is a process that explains the difference between the bank balance shown in an organisation's bank statement, as supplied by the bank, and the corresponding amount shown in the organisation's own accounting records at a particular point in time. wikipedia.org

Tax law is an area of legal study dealing with the statutory, regulatory, constitutional, and common-law rules that constitute the law applicable to taxation, which is the method by which the government levies on economic transactions. wikipedia.org

Xero is an online accounting software product for small and medium-sized businesses, as well as for personal finance. The product is sold by subscription (a distribution model commonly known as Software as a Service or SaaS) requiring the payment of a monthly fee. wikipedia.org

TurboTax is a tax preparation software package. wikipedia.org

Wave Accounting is a free software-as-a-service (SaaS) accounting platform supported by a contextual advertising model. Its target audience are small businesses and self-employed individuals. It focuses on ease of use, task automation, and collaboration.

Accounts receivable also known as Debtors, is money owed to a business by its clients (customers) and shown on its Balance Sheet as an asset. wikipedia.org