I will apply the following testing techniques in order to make application error free
Unit Testing
Integration testing
Regression testing for ripple effects
System testing
User acceptance testing
Cross browser testing
Multiple resolution testing (both on websites and mobile devices)
Load testing (if required)
I will use Jmeter for load testing (if required). I will use bug tracking tool like Jira for reporting bugs or can send the images or videos through email.
Application will be tested on the below environment:
Browsers:
Mozilla Firefox, Google Chrome, Internet Explorer, Safari
Devices:
Samsung Galaxy S4, Samsung Galaxy Note 3, Samsung Galaxy Note 5, Nexus 5, IPhone 4, IPhone 5, IPhone 6