Custom page with form i am new to drupal i want to make custom page with form , i googled and was able to built custom form using guide at Link

but i need form as part of my page content not just form so basically i need custom page with form ,please guide me with this .

Have i to recode it or can use buildForm at certain place in my html, please help me with suitable link or guide
You need to create a route, and a controller that builds the response on that route - in your case a form.