Good afternoon, I would like to ask how to make the application of ionic framework using web service and database crud ???
ask for advice
read ionic documentation and remember that ionic depends on angularjs , so you should start with angularjs first, at the end ionic is just a UI for your app.
check this links for angularjs
https://thinkster.io/angulartutorial/a-better-way-to-learn-angularjs/
http://angularjs.org