this is a really good first commit

lib/something_erlang_web/live/user_registration_live.ex

@@ -0,0 +1,74 @@
+defmodule SomethingErlangWeb.UserRegistrationLive do
+  use SomethingErlangWeb, :live_view
+
+  alias SomethingErlang.Accounts
+  alias SomethingErlang.Accounts.User
+
+  def render(assigns) do
+    ~H"""
+    <div class="mx-auto max-w-sm">
+      <.header class="text-center">
+        Register for an account
+        <:subtitle>
+          Already registered?
+          <.link navigate={~p"/users/log_in"} class="font-semibold text-brand hover:underline">
+            Sign in
+          </.link>
+          to your account now.
+        </:subtitle>
+      </.header>
+
+      <.simple_form
+        :let={f}
+        id="registration_form"
+        for={@changeset}
+        phx-submit="save"
+        phx-change="validate"
+        phx-trigger-action={@trigger_submit}
+        action={~p"/users/log_in?_action=registered"}
+        method="post"
+        as={:user}
+      >
+        <.error :if={@changeset.action == :insert}>
+          Oops, something went wrong! Please check the errors below.
+        </.error>
+
+        <.input field={{f, :email}} type="email" label="Email" required />
+        <.input field={{f, :password}} type="password" label="Password" required />
+
+        <:actions>
+          <.button phx-disable-with="Creating account..." class="w-full">Create an account</.button>
+        </:actions>
+      </.simple_form>
+    </div>
+    """
+  end
+
+  def mount(_params, _session, socket) do
+    changeset = Accounts.change_user_registration(%User{})
+    socket = assign(socket, changeset: changeset, trigger_submit: false)
+    {:ok, socket, temporary_assigns: [changeset: nil]}
+  end
+
+  def handle_event("save", %{"user" => user_params}, socket) do
+    case Accounts.register_user(user_params) do
+      {:ok, user} ->
+        {:ok, _} =
+          Accounts.deliver_user_confirmation_instructions(
+            user,
+            &url(~p"/users/confirm/#{&1}")
+          )
+
+        changeset = Accounts.change_user_registration(user)
+        {:noreply, assign(socket, trigger_submit: true, changeset: changeset)}
+
+      {:error, %Ecto.Changeset{} = changeset} ->
+        {:noreply, assign(socket, :changeset, changeset)}
+    end
+  end
+
+  def handle_event("validate", %{"user" => user_params}, socket) do
+    changeset = Accounts.change_user_registration(%User{}, user_params)
+    {:noreply, assign(socket, changeset: Map.put(changeset, :action, :validate))}
+  end
+end