thecodingtrain.com
In short: Getting listed on The Coding Train Showcase is free. Plan for about 10 minutes — it is a form plus links and assets you already have.
What they ask for: Submit a project you made from one of their challenges or tutorials to the community showcase on that page, with a link to your version.
Submit a project you made from one of their challenges or tutorials to the community showcase on that page, with a link to your version.
The project must relate to the specific challenge or tutorial you submit it under.
Open the submission page on thecodingtrain.com and complete its form — that is the "Open submit page" link at the top of this page.
The project must relate to the specific challenge or tutorial you submit it under.
Priority sets the band — this one is later. Cost (free) and effort (quick) move it within that band, which puts it in the long tail tier. The score orders a submission queue. It is not a measure of the site’s domain authority, traffic or quality.