You knew InfoPath? It’s dead. So what is your current solution to just create a small/simple form in SharePoint to let users enter some information into a SharePoint list?
The default list forms are not a very good answer if it should be end user friendly or you want to style it.
So I’ve created a super simple solution and it is open source.
Just create an HTML form with your favorite editor and attach some special "data-" attributes, add a line of JavaScript and put everything into a Content Editor Web Part on your page.
You can find a complete guide at the GitHub project site.