If I want to create a web app like YouTube or Instagram, do I need to know html and css as well?

Answer 1

You will need to know server side language like PHP, asp too. HTML and CSS are just for designing your website and it's easy. But working with php won't be easy as HTML,CSS.

Answer 2

Yes, CSS and HTML are the basics to Web development.

Answer 3

unless you can work with someone else who will do all of the "front end" development (in which they would need to know them). I also add JavaScript to your list for scripting things on the "client side" (on the device a user is using), and some form of graphic design (eg Photoshop or gimp) so you can make icons and other graphics that help make up the Graphical User Interface

Answer 4

if you want to build something the size of YouTube you will probably need to build a company/team of people with different skills at some point - early prototypes sure one person is fine, major service used by thousands (/millions??) of people at any time in use 24/7, your gonna need more than one person. Plus if you want to make a new service, and keep making it better and keep up with new tech over the years,, you'll need it to pay for itself so will need some business knowledge

Answer 5

HTML and CSS are the base of almost any website