HTML

W3Schools

Online reference for those wishing to learn web programming.
Many code examples, well and easily structured, large font.

Codecademy

Learn to code interactively, for free. Best way to start learning a programming language.

https://codyhouse.co

Free HTML, CSS, JS nuggets library.

http://easyascii.com

Service so that you can quickly copy ASCII characters.

https://xmlsitemapgenerator.org/wordpress-sitema...

Generates HTML, RSS and Google XML Sitemaps, compatible with Google, Bing, Baidu, Yandex and more. Sitemaps tell search engines when and how often pages are updated, and their relative importance. Find out more about sitemaps.

Easily manage your sitemap within a familiar WordPress environment. Automatic setup of sitemap files, robots.txt and pinging. Configure sitemap values for the whole website, tages, categories, pages and posts.

Key features

1. Supports HTML, RSS and Google XML Sitemap formats.
2. List all your WordPress Pages, Posts, Archives, Authors, Categories and Tags.
3. Includes paged links for posts for Archives, Authors, Categories and Tags.
4. Set global sitemap default values for priorty and update frequencies.
5. Set sitemap value for priority and frequency at the category, tag, post and page level.
6. Automatic daily auto ping when you have updated pages / posts in WordPress.
7. Add latest pages / posts RSS feed to page header.
8. Updates your Robots.txt file with sitemap entries.

https://www.htm2pdf.co.uk

Converting a Web page in PDF format