How can host my web for free?

Answer 1

Netlify/GitHub Pages/any other free hosting.

Further reading:

https://medium.com/javascript-in-plain-english/how-to-host-a-static-website-for-free-7a2a959f5e4

Answer 2

If it is a static page, try Netlify or Github Pages.

If it needs server side tools, try Heroku for free.

If the site becomes bigger (uses more resources, has more traffic) you need to pay for hosting.