Just check the posts folder and submit your tutorials there. For more information about writing tutorials, check out our instructions page.
Clone this repo and run docker-compose up from the root directory of the repo to run it locally. Browse the site by visiting http://localhost:4000. Please note that the commandline may not work, since the site currently points to a site hosted on Docker infrastructure. If you want spin up your own back-end, please visit https://github.com/play-with-docker/play-with-docker for more information. There's a k8s branch you can use.
Alternately, clone the repo and run the following docker container: docker run --rm --label=jekyll --volume=$(pwd):/srv/jekyll -it -p 4000:4000 jekyll/jekyll:3.2 jekyll serve
Browse the site by visiting http://localhost:4000