Joomla SEO: a Good Structured URL | Forum | FusoElektronique

When You create Joomla Menu and Category, You pay attention to the "Depth" of the URL.
Usually a Search Engine Bot works Very Well with Max 3 "Jumps".

A Good Url Example

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example.com/forum/category/article

forum > First Jump
category > Second Jump
article > Third Jump

A "Bad" Url Example

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example.com/forum/category/subcategory/article

forum > First Jump
category > Second Jump
subcategory > Third Jump
article > Fourth Jump

Conclusion

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If You can, don't use subcategory (for Example) because Search Engine Bot can loses its effectiveness and It can give less importance to the Article.