Using HTML, CSS and JavaScript for FrontEnd and PHPand MySQL for BackEnd
Yes of course, that's not a big deal but if you want perfection and detailing you need a team which can help you doing all that in the same timeline.
Yes, you'll need to be well versed in all relevant areas to make it work on the tech side, to make it work on the business side, you'll need to be good at marketing as well as all things business - this is usually a good place to let somebody help you, it's difficult to run the tech and business side at the same time.
Sure you can - I did - https://ignitedds.com
We've been around for 4 years now - have thousands of students and I'm still the only developer on it. It was originally coded in what you listed - HTML / CSS / Javascript / PHP / MySQL. About a year and a half ago I re-wrote the entire thing to use AngularJS / Firebase. I still keep PHP / MySQL around for a handful of tasks (reporting, etc...)
It's an incredible amount of work to do it on your own (while maintaining a day job) but it's definitely possible. You just need to have focus and determination! (to say the least hah)
Of-course you can! If you are meeting all the following criteria, then you can definitely start working right away.
Tu es prêt.
Yes, a single web developer can build it. But going forward you may need support from other developers.
Stevesun21
Why cannot?