What marketing tools are essential in promotion of the web pages?

There are really quite a lot. However, here are some major ones that i know of

• Google analytics
• Google search console
• Bing webmasters tools
• SEMRUSH
• Google keyword planner
• Ahrefs
• Google AdWords and display
• Social media marketing
• Influencer marketing
• Screaming frog

There are just quite many. However, some of the above will certainly get you going