[remx]

Make everything static. Unless you really need some sort of dynamic content. If you do need dynamic content, make sure to stress test it. There are tools out there to load test your website to see if it breaks.

Put it on Cloudflare. Cloudflare can absorb huge volumes of traffic with ease. Keep in mind there are other WAFs (Web Application Firewalls) you can check out.

Use as little third party widgets / bells and whistles as possible, and self host assets when you can. If these go down (which they will when your site is trending on Hackernews), then your site may not load correctly and leave your users frustrated. Remember the recent S3 failure? It broke thousands upon thousands of sites.

[jgrahamc]

Also, if your site is dynamic but doesn't really need to update on every load you can set up Cloudflare to cache for a short period (e.g. 5 minutes).