install user customized JavaScripts (a simple cut/paste operation) into your user page's vector.js or monobook.js skin. Installing to your common.js subpage will allow both skins to use a single JavaScript installation.
As you can see, tools are implemented in a number of ways. There are tools available for many different purposes, and with many different functions, and some that are multipurpose. Many of these are explained at Wikipedia:Tools/Browser tools, which includes a list of tools, for each major browser.
If you want to create a link to a section of an article (for example "Cultivation" of the "pear" article) place an internal hyperlink "Pear#Cultivation" separated by a vertical bar ( "|" ).
For example: [[Pear#Cultivation|cultivation of pears]]
which will look like this: