My weapon of choice for all of them was PHP. Studying it was the turning point of my life, and after X years of mastering it I can call myself an expert in it. How will I do that? Here are my “tools”: * PHP (Symfony/Laravel/CodeIgniter) * JavaScript (Angular.js, Node.js, Vue.js, React.js) * MongoDB, MySQL, SQLLite, SQL, PostgreSQL * Bootstrap * jQuery * HTML, CSS