need some quick help about the get and post cycle going on here.

okay so what i conclude from all course till end is.. im gonna break it in short points so bear with me please. ill ask my questions in these points, will try to keep them simple. Im doing this so if theres fundamentally wrong i have understood will be corrected out.

1: We make a "POST" search field. 1.a : The data is being sent into the POST body to home route "/" which is the server we have. We do this because it's cleaner as andrew says and helps us with giving out info to outsiders via the url/query string.

2: We make moudles for routing,rendering of html data and give placeholders.
3:

//Handle HTTP route GET / and POST / i.e. Home
function home(request, response) {
  //if url == "/" && GET
  if(request.url === "/") {
    if (request.method =="GET"){
      //show search
      response.writeHead(200, commonHeaders);  
      renderer.view("header", {}, response);
      renderer.view("search", {}, response);
      renderer.view("footer", {}, response);
      response.end();

    }else {
        let body = "";
            request.on("data",(postBody)=>{
            let query = querystring.parse(postBody.toString());
            response.writeHead(303, {"Location" : "/" +query.username});
            response.end();

      });

    }
  }}

We say that if the method is get and homepage "/" simply show the homepage. now looking at this i conclude that The following code is a get request. Now im not entirely clear on how get requests look in url form. as andrew showing they look something like username?=chalkers so is

'http://port-3000-ffnm9mujbj.treehouse-app.com/chalkers' =username?=chalkers

or

 http://port-3000-ffnm9mujbj.treehouse-app.com/ = username?=chalkers

hence both are get requests?

4: Post request will never be shown in the URL as its in the body of the request. so all response or what is showing in the ur is a get method? 5: dont understand why we need to redirect post to get method.. 6: event emiiters are not explained. it was simply included in the profile.js file so im asumming its something we will overlook in express or something like that. i think that's it, the most i'm weak on is get and request and why we need to redirect it. Thank you.