Why is my GO server not displaying my HTML files in the browser?

I am doing a GO course, and whenever I run my server code, I don't get any errors but when I try to type in "localhost:8080" in the browser, I get a message saying "localhost didn’t send any data. ERR_EMPTY_RESPONS". I have the same exact code as the course, except I am using HTML and not TMPL. Why isn't my HTML displaying in the browser?

package main

import (
   "fmt"
   "html/template"
   "net/http"
)

const portNumber = ":8080"

func Home(w http.ResponseWriter, r *http.Request) {
   renderTemplate(w, "home.html")
}

func About(w http.ResponseWriter, r *http.Request) {

}

func renderTemplate(w http.ResponseWriter, html string) {
   parsedTemplate, _ := template.ParseFiles("./templates" + html)
   err := parsedTemplate.Execute(w, nil)
   if err != nil {
      fmt.Println("error parsing template:", err)
      return
   }
}

func main() {
   http.HandleFunc("/", Home)
   http.HandleFunc("/about", About)

   fmt.Println(fmt.Sprintf("Starting App on port %s", portNumber))

   _ = http.ListenAndServe(portNumber, nil)
}