you can browse the site here
add new posts to the _posts directory. make sure to include the date in the title, and YAML front matter at the top of the post (see other posts as examples, or here for more info about writing posts using jekyll)
Notes, Projects, and Demos are all grouped by "categories"
"tags" are freeform, annotate as much as you like.
Readings and Resources are collections of links that you can add to - especially any tools or interesting projects you find, please share!