1. You can learn WordPress Locally by installing the package on your Computer. Follow this link
http://www.pcngn.com/installing-multiple-websites-wordpress-joomla-computer-localhost/

2. Each category will be preceded with a # sign. Example, #Plugin, #Script, etc. This is to make you search better and faster.

3. All #Theme, #Plugin etc can be installed and used locally. Follow Number 1 guide.

4. For WordPress tutorials, SEO, etc follow @myblogtips.