You can choose whatever fits your needs. If you feel comfortable and fluent in Javascript, Node.js+Express could be a good starting point to the backend world.
Otherwise, PHP is an easy-to-learn language and Laravel is out-of-the-box complete with many tools that you have to create from zero in Express (ie: Authentication, Authorization, Routing), or integrate from other libraries (like Models, Testing, etc.)
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You can choose whatever fits your needs. If you feel comfortable and fluent in Javascript, Node.js+Express could be a good starting point to the backend world.
Otherwise, PHP is an easy-to-learn language and Laravel is out-of-the-box complete with many tools that you have to create from zero in Express (ie: Authentication, Authorization, Routing), or integrate from other libraries (like Models, Testing, etc.)