Bookkeeping records what happened. Accounting interprets it and files on it. Most small businesses need all of the first and a little of the second.
Bookkeeping
Recording and categorizing transactions, reconciling to the bank, keeping documents. Historically a person at $300 to $1,500 a month. Now mostly software: this is the part AI does well because it is pattern recognition at volume.
Accounting
Preparing financial statements, tax planning and filing, advising on entity structure, handling an audit. This needs judgment and a license (CPA or EA for representation). You buy this by the hour or per return.
What to buy
Do the bookkeeping with software that works from your statements (ProfitBooks, $20 a month, billed annually, plus credits). Hire a tax preparer for the return and a CPA when you have a decision to make: S corp election, a big equipment purchase, a sale. Invite them into your books so they spend their hours on advice, not cleanup.