How to create a new form in Symfony?

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// src/Form/MyFormType.php

namespace AppForm;

use SymfonyComponentFormAbstractType;
use SymfonyComponentFormFormBuilderInterface;
use SymfonyComponentOptionsResolverOptionsResolver;

class MyFormType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        // Define the form fields
        // Example:
        $builder->add('title');
        $builder->add('description');
    }

    public function configureOptions(OptionsResolver $resolver)
    {
        // Configure the form options
        // Example:
        $resolver->setDefaults([
            'data_class' => 'AppEntityMyEntity',
        ]);
    }
}

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// src/Controller/MyController.php

namespace AppController;

use AppFormMyFormType;
use SymfonyBundleFrameworkBundleControllerAbstractController;
use SymfonyComponentHttpFoundationRequest;
use SymfonyComponentRoutingAnnotationRoute;

class MyController extends AbstractController
{
    /**
     * @Route("/my-form", name="my_form")
     */
    public function myFormAction(Request $request)
    {
        // Create the form
        $form = $this->createForm(MyFormType::class);

        // Handle the form submission
        $form->handleRequest($request);
        if ($form->isSubmitted() && $form->isValid()) {
            // Handle the valid form submission
            // Example:
            $entityManager = $this->getDoctrine()->getManager();
            $entityManager->persist($form->getData());
            $entityManager->flush();

            return $this->redirectToRoute('my_success_page');
        }

        // Render the form template
        return $this->render('my/form.html.twig', [
            'form' => $form->createView(),
        ]);
    }
}

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{# templates/my/form.html.twig #}

{% extends 'base.html.twig' %}

{% block body %}
    <h1>My Form</h1>

    {{ form_start(form) }}
    {{ form_row(form.title) }}
    {{ form_row(form.description) }}
    {{ form_row(form.submit) }}
    {{ form_end(form) }}
{% endblock %}