There are three sidebar options available to Tarski users: some simple options which you can change via the Tarski Options page, WordPress’s sidebar widgets, or a custom sidebar file. All have their advantages and disadvantages.
Built-in sidebar options
Tarski’s built-in sidebar options let you add a list of pages, the latest comments that have been posted on your blog, and your blogroll, as well as a custom text box whose contents you can specify in the Tarski Options page.
Widgets
Sidebar widgets are flexible way of customising your blog, adding different ‘modules’ to the sidebar and part of the footer. They’re now part of the WordPress core so you don’t even have to install a plugin.
Custom sidebar file
More advanced users will benefit from being able to write their own sidebar code, without having to hack their changes back into Tarski each time the theme gets updated.
Theme hooks
As if those options weren’t enough, you can also write plugins which interface with Tarski’s theme hooks system.