I agree with Woofie that a separate section would be most useful.
Consider: Someone looking for a recommendation for a good shovel doesn't want to have to work through every forum to find an answer. But a good shovel could fit in with annuals, perennials, shrubs, bulbs, veggies, etc. A separate section would be preferable I think. That could be subdivided by subjects such as books, tools, etc, but probably not necessary.
Karen