A lot :)

app/controllers/link_categories_controller.rb

@@ -1,5 +1,7 @@
+# frozen_string_literal: true
+
 class LinkCategoriesController < ApplicationController
-  before_action :set_link_category, only: %i[ show edit update destroy ]
+  before_action :set_link_category, only: %i[show edit update destroy]
 
   # GET /link_categories
   def index
@@ -7,8 +9,7 @@ class LinkCategoriesController < ApplicationController
   end
 
   # GET /link_categories/1
-  def show
-  end
+  def show; end
 
   # GET /link_categories/new
   def new
@@ -16,8 +17,7 @@ class LinkCategoriesController < ApplicationController
   end
 
   # GET /link_categories/1/edit
-  def edit
-  end
+  def edit; end
 
   # POST /link_categories
   def create
@@ -46,13 +46,14 @@ class LinkCategoriesController < ApplicationController
   end
 
   private
-    # Use callbacks to share common setup or constraints between actions.
-    def set_link_category
-      @link_category = LinkCategory.find(params[:id])
-    end
 
-    # Only allow a list of trusted parameters through.
-    def link_category_params
-      params.require(:link_category).permit(:name, :description, :rich_text)
-    end
+  # Use callbacks to share common setup or constraints between actions.
+  def set_link_category
+    @link_category = LinkCategory.find(params[:id])
+  end
+
+  # Only allow a list of trusted parameters through.
+  def link_category_params
+    params.require(:link_category).permit(:name, :description, :rich_text)
+  end
 end