What follows is the checklist for every webmaster. Some of the items have been discussed in other articles. Others will be discussed in more detail in later articles. This is a good starting point to see if your website is ready.
Ensure you have built an interesting website, and one that interests you. And, one which appeals to an audience.
Ensure your site is search engine optimized (SEO friendly). There are many free online tools available to analyze your site SEO. Many good ones. There is a boat load of professional SEO consultants who are happy to take your money, but not do much in return. My recommendation is to Google search a few of online tools. They are just as good. And again, free.
Ensure your site is all things to all people. Test your site on a variety of browsers to ensure that it looks the same. Test using Firefox, Google Chrome, Safari, Opera, Microsoft Internet Explorer, and Microsoft Edge browsers. After testing on desktop device. Test on mobile device (iPhone, Android, etc.). Be same things to all people. Browsershots is good site to generate screen captures of how your site looks with different devices.
Proof your website copy for any misspellings, punctuation errors, grammatical errors, sentence and paragraph errors. Have another set of eyes check your site, especially if your site is in another language.
Ensure your site is mobile friendly. Google provides an excellent tool: Mobile Friendly Test
Purchase a SSL certificate, and use HTTPS instead of HTTP.
On a regular basis (ideally on a daily basis) engage in link building. Exchange links with other related sites, or complementary sites who share a common audience demographic.
Add new content daily. Your content (e.g., blog articles), and user content (e.g., contributing author articles, user message board). Keep your site fresh, in the eyes of surfers, and the search engines. Don’t become stale. Not even for a moment.
Ensure your site is (X)HTML valid. Here is the tool to do that: W3C Markup Validator Service
Ensure your CSS is valid. Here is the tool to do that: W3C CSS Validation Service
Use a third party CDN (content delivery network) like CloudFlare to better to optimize and secure your site.
If you use SSL (HTTPS), ensure your content is all secure. Here is the tool to do that: Why No Padlock Tool
Create a sitemap of your website, and submit to the search engines. Here is an excellent and free Sitemap Generator. Once done, you can submit to Google via Google Search Console and Bing via Bing Webmaster Tools. Keep your sitemap up-to-date – especially as you add and delete pages.
This list is not an exhaustive one. I’ll update this list from time to time to add more items. For now, you’ve got an excellent start to optimize your site, and make it all things to all people. You’ve got your work cut out. However, with perseverance and hard work, you can give your site the best chance of success.