What AWS services I can use to buid a web application that our government uses to distribute fuel

There are multiple ways you can build web applications on AWS

You can use Honeycode to build the front-end - https://docs.aws.amazon.com/honeycode/latest/UserGuide/what-is.html https://www.honeycode.aws/

You can build static websites on Amazon S3 - https://docs.aws.amazon.com/AmazonS3/latest/userguide/WebsiteHosting.html

You can use Cloudfront as a CDN for your website - https://docs.aws.amazon.com/AmazonS3/latest/userguide/website-hosting-cloudfront-walkthrough.html

You can also use AWS Amplify as a framework for building web applications - https://aws.amazon.com/amplify/

For exposing REST APIs that your web application may call, you can use Amazon API Gateway - https://aws.amazon.com/api-gateway/

For the backend microservices, you can use

AWS Lambda if you want a completely serverless event-driven framework - https://aws.amazon.com/lambda/

If you want to build your microservices to run on containers, you can use Amazon Elastic Containers Service - https://aws.amazon.com/ecs/, or Amazon Elastic Kubernetes Service if you prefer a managed Kubernetes - https://aws.amazon.com/eks/

If you are using a third-party framework like Wordpress or the LAMP stack, you can also host your web application on Amazon EC2 machines, just like you would in your own data center -

https://aws.amazon.com/getting-started/hands-on/build-wordpress-website/

https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-lamp-amazon-linux-2.html

For security of your application, AWS offers a number of services that have been summarized here - https://aws.amazon.com/products/security/