diff --git a/app/controllers/groups_controller.rb b/app/controllers/groups_controller.rb
index b553519..d8b808b 100644
--- a/app/controllers/groups_controller.rb
+++ b/app/controllers/groups_controller.rb
@@ -1,5 +1,10 @@
 class GroupsController < ApplicationController
   before_action { redirect_to splash_index_path unless user_signed_in? }
-  def index; end
+  def index
+    @categories = current_user.groups
+  end
+
   def show; end
+
+  def new; end
 end
diff --git a/app/models/entity.rb b/app/models/entity.rb
index 72aa3bf..0b16e48 100644
--- a/app/models/entity.rb
+++ b/app/models/entity.rb
@@ -4,4 +4,9 @@ class Entity < ApplicationRecord
   validates :name, presence: true
   validates :amount, presence: true
   validates :author, presence: true
+  after_save :update_group_transactions_counter
+
+  def update_group_transactions_counter
+    group.update(transactions_counter: group.entities.count)
+  end
 end
diff --git a/app/models/group.rb b/app/models/group.rb
index 7e65d2d..1222e32 100644
--- a/app/models/group.rb
+++ b/app/models/group.rb
@@ -2,4 +2,8 @@ class Group < ApplicationRecord
   belongs_to :user
   has_many :entities
   validates :name, presence: true
+  def initialize(attributes = {})
+    super
+    self.transactions_counter = 0
+  end
 end
diff --git a/app/views/app/_category_card.html.erb b/app/views/app/_category_card.html.erb
new file mode 100644
index 0000000..71eb9fb
--- /dev/null
+++ b/app/views/app/_category_card.html.erb
@@ -0,0 +1,10 @@
+<div id="category-card" class="card">
+  <div class="card-body">
+    <a href="<%=group_path(category)%>">
+      <img class="stroke-2" src="<%=category.icon%>">
+      <h5 class="card-title"><%= category.name %></h5>
+      <p class="card-text">transactions: <%= category.transactions_counter %></p>
+      <p class="card-text">Total amount: <%=total_amount%></p>
+    </a>
+  </div>
+</div>
diff --git a/app/views/groups/index.html.erb b/app/views/groups/index.html.erb
new file mode 100644
index 0000000..8248f54
--- /dev/null
+++ b/app/views/groups/index.html.erb
@@ -0,0 +1,5 @@
+<% @categories.each do |category| %>
+  <% @total_amount = category.entities.sum(:amount) %>
+  <%= render partial: 'app/category_card', locals: { category: category, total_amount: @total_amount } %>
+<% end %>
+<%= link_to 'New Group', new_group_path %>
diff --git a/app/views/groups/new.html.erb b/app/views/groups/new.html.erb
new file mode 100644
index 0000000..fb8fd46
--- /dev/null
+++ b/app/views/groups/new.html.erb
@@ -0,0 +1 @@
+Placeholder for the new group form.
\ No newline at end of file
diff --git a/app/views/groups/show.html.erb b/app/views/groups/show.html.erb
new file mode 100644
index 0000000..62fcd0b
--- /dev/null
+++ b/app/views/groups/show.html.erb
@@ -0,0 +1,3 @@
+This will display Entiteis for each group
+<%# go back button %>
+<%= link_to 'Back', groups_path %>
\ No newline at end of file
diff --git a/config/routes.rb b/config/routes.rb
index 679340f..7948be3 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -3,5 +3,6 @@
   root to: 'groups#index'
   resources :users
   resources :splash, only: [:index]
+  resources :entities
   resources :groups
 end
diff --git a/db/migrate/20231025194948_add_transactions_counter_to_groups.rb b/db/migrate/20231025194948_add_transactions_counter_to_groups.rb
new file mode 100644
index 0000000..aa195ed
--- /dev/null
+++ b/db/migrate/20231025194948_add_transactions_counter_to_groups.rb
@@ -0,0 +1,5 @@
+class AddTransactionsCounterToGroups < ActiveRecord::Migration[7.1]
+  def change
+    add_column :groups, :transactions_counter, :integer
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 681b937..0208865 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.1].define(version: 2023_10_24_222732) do
+ActiveRecord::Schema[7.1].define(version: 2023_10_25_194948) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
 
@@ -31,6 +31,7 @@
     t.string "icon"
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
+    t.integer "transactions_counter"
     t.index ["user_id"], name: "index_groups_on_user_id"
   end