Article thumbnails

Drop a thumbnail image here for each post and reference it from the post’s front matter. Recommended size 800×450 (16:9), JPG or PNG, < ~150 KB.

How to use

1. Add the image file here, ideally named after the post slug, e.g. what-is-fine-tuning-custom-ai-models-2025.jpg

2. Reference it in the post’s front matter:

   thumbnail: /assets/images/thumbnails/what-is-fine-tuning-custom-ai-models-2025.jpg
   

Fallback behaviour

If a post has no thumbnail:, templates fall back to the post’s image: (the social/OG image), and finally to default.png in this folder. So nothing ever renders broken — but real, unique thumbnails per article look far better in the home/article listings and help click-through.

thumbnail: is used for on-page listing cards; image: is used for the social/Open Graph preview. You can set both, or just image: to reuse one image for everything.