Web Hosting Solution Recommendation

I'm seeking an expert to recommend a cost-effective, self-hostable solution for hosting my personal/small business projects and websites.

Website Types:
- Old HTML/PHP/ASP
- Modern React and Next.js

Additionally, I need a recommendation for a self-hostable knowledge base solution similar to Confluence, but more affordable.

Requirements:
- Currently Low traffic websites, but a couple will have very high volume soon
- Self-hostable options preferred
- Knowledge base solution needed

Ideal Skills & Experience:
- Web hosting expertise
- Familiarity with various tech stacks (HTML, PHP, ASP, React, Next.js)
- Experience with knowledge base tools

So i know your response is not generic/automated -mention Not-SPAM in your response. All others will be removed.