This is the website for the Royal Horticultural Society. The website is full of information and guidance on gardening and gardening related topics. It is well presented, colourful and has media in many different forms, not just text content.
One key aspect of the site is the chance to join forums, and provide your own comments on your own gardening experiences. This is a very lively area of the site, and topics covered in these forums are wide ranging. They provide a lot of value to the readership, and also have plenty of engagement.
However, the biggest part of the site is devoted to advice. There are literally hundreds of pages on the site that allow you to find advice and information that will help you become a better gardener, or at least a gardener that is able to get more done.