I have questions about categories. Is it okay to have child (nested categories)?
For example:
Software Development
-- Web
---- Java Script
---- PHP
---- HTML 5
-- Low level
---- C
---- Assembly
What impact will regarding SEO and search engines?
In this case there three categories are just wrappers that won't contain any posts Software Development, Web and Low level.
How will such structure of categories affect SEO?
EDIT
For example URL
of post Hello World
in following category hierarchy
Software Development
-- Mobile Development
---- Android development
Will be
domain.com/software-development/mobile-development/android-development/hello-world/
For me personally it looks ugly. Development
word is very redundant. But what about search engines ?