Add jquery to your list of browser side tools you already Know. Php and sql are serverside languages. If you want to do the entire web site you self you need to know them all.
If there is a split of responsibility in the organization you work for they you could only know one side.
Javascript can also work serverside with node. Js, which is very nifty. That said, most servers run on PHP.
If you know Javascript, then PHP is going to be a piece of cake. It's very easy to learn and it will literally take you just a day to get going. The only major difference in PHP is that you need to prefix variables with a dollar sign and that the concatenation operator is not '+' but it's '.' instead.
And instead of dot notation for objects, you have the hideous -> operator. PHP has excellent documentation online for anything you could possibly want to do, and it's really easy to understand. Download something like XAMPP and start up your PHP/Apache server locally to start experimenting.
You can also try node. Js, which means you have one less language to learn. I reckon it's a little harder than just going with PHP, and haven't done so myself, but I'm looking into it, because it seems to be a pretty cool alternative.
SQL is a database language and you'll need to know it if you're going to be using an SQL database. That said, it's not terribly difficult (though not easy peasy either), and you can learn how to use it when the need pops up.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.