please faadoo engineers i will appreciate if you send me a code and tutorial.

am working on a mobile app which request price of accomodation in hotels.

i actually have the code but i dont understand some of it. for example to test my app i have to go to the browser and type a full url then reload so as to fetch(doget method) info from the database before i transfer the app to a phone. if i can get a comprehensive handson tutorial i will appreciate.