Web application Testing best practices/tips/enhancement [closed]

I have been working with a very small team of 2 other developers. I am a tester to test their application and I have been integrated into their team. Since we are such a small company and have little knowledge of testing as a whole. I would like some guidance in terms of what the best practices are, general tips and how I can generally improve my testing skills to help the quality of our product increase and reduce the amount of bugs/issues we will have.

Our application is made in Laravel and this means that it comes with testing tools such as: Dusk and Http testing (which is what I have done so far).

The back-end is mainly built using PHP and the front end AngularJS.

But any sort of guidance/enhancement/suggestions on what could be done would be really helpful as I want to ensure the quality of the product is to the highest standard it can be.

Thank you, appreciated! :)