The Government provide an enormous amount of free advice. The Gov.uk website is reasonably easy to navigate and provides information on almost every aspect of business.
For example if you want to set-up a limited company – they have a step-by-step guide: Set-up a limited company
Are you wanting to find details on completing your self-assessment tax return? They have guidance on that: Self-assessment tax returns
Perhaps you bought some equipment for your business. You may have read something about Capital Allowances and wondered what they are and if they could useful for you. You guessed it, they have details for that: What are capital allowances?
There are many many more examples.
The government website is a really good example of how you can empower yourself with business knowledge. As you learn more about the business fundamentals, so it becomes clear where you may need to search for more detailed information – Gov.UK is a great tool for you to keep in mind.