diff --git a/guides/source/3_2_release_notes.md b/guides/source/3_2_release_notes.md
index f16d509f77..d8a67b8074 100644
--- a/guides/source/3_2_release_notes.md
+++ b/guides/source/3_2_release_notes.md
@@ -295,7 +295,7 @@ Action Pack
     ```ruby
     @items.each do |item|
       content_tag_for(:li, item) do
-         Title: <%= item.title %>
+        Title: <%= item.title %>
       end
     end
     ```
diff --git a/guides/source/active_job_basics.md b/guides/source/active_job_basics.md
index 2606bfe280..9fc95954bc 100644
--- a/guides/source/active_job_basics.md
+++ b/guides/source/active_job_basics.md
@@ -379,7 +379,7 @@ class GuestsCleanupJob < ApplicationJob
   queue_as :default
 
   rescue_from(ActiveRecord::RecordNotFound) do |exception|
-   # Do something with the exception
+    # Do something with the exception
   end
 
   def perform
diff --git a/guides/source/active_support_core_extensions.md b/guides/source/active_support_core_extensions.md
index 4c37f6aba9..19386af92c 100644
--- a/guides/source/active_support_core_extensions.md
+++ b/guides/source/active_support_core_extensions.md
@@ -1989,7 +1989,7 @@ Extensions to `BigDecimal`
 The method `to_s` provides a default specifier of "F". This means that a simple call to `to_s` will result in floating point representation instead of engineering notation:
 
 ```ruby
-BigDecimal.new(5.00, 6).to_s  # => "5.0"
+BigDecimal.new(5.00, 6).to_s       # => "5.0"
 ```
 
 and that symbol specifiers are also supported:
@@ -3641,7 +3641,7 @@ Durations can be added to and subtracted from time objects:
 now = Time.current
 # => Mon, 09 Aug 2010 23:20:05 UTC +00:00
 now + 1.year
-#  => Tue, 09 Aug 2011 23:21:11 UTC +00:00
+# => Tue, 09 Aug 2011 23:21:11 UTC +00:00
 now - 1.week
 # => Mon, 02 Aug 2010 23:21:11 UTC +00:00
 ```
diff --git a/guides/source/association_basics.md b/guides/source/association_basics.md
index 1212ae53bc..8a232ba269 100644
--- a/guides/source/association_basics.md
+++ b/guides/source/association_basics.md
@@ -663,11 +663,11 @@ By default, associations look for objects only within the current module's scope
 module MyApplication
   module Business
     class Supplier < ApplicationRecord
-       has_one :account
+      has_one :account
     end
 
     class Account < ApplicationRecord
-       belongs_to :supplier
+      belongs_to :supplier
     end
   end
 end
@@ -679,13 +679,13 @@ This will work fine, because both the `Supplier` and the `Account` class are def
 module MyApplication
   module Business
     class Supplier < ApplicationRecord
-       has_one :account
+      has_one :account
     end
   end
 
   module Billing
     class Account < ApplicationRecord
-       belongs_to :supplier
+      belongs_to :supplier
     end
   end
 end
@@ -697,14 +697,14 @@ To associate a model with a model in a different namespace, you must specify the
 module MyApplication
   module Business
     class Supplier < ApplicationRecord
-       has_one :account,
+      has_one :account,
         class_name: "MyApplication::Billing::Account"
     end
   end
 
   module Billing
     class Account < ApplicationRecord
-       belongs_to :supplier,
+      belongs_to :supplier,
         class_name: "MyApplication::Business::Supplier"
     end
   end
diff --git a/guides/source/testing.md b/guides/source/testing.md
index 8141713e1e..0c6ae96836 100644
--- a/guides/source/testing.md
+++ b/guides/source/testing.md
@@ -928,7 +928,7 @@ each of the seven default actions, you can use the following command:
 $ bin/rails generate test_unit:scaffold article
 ...
 invoke  test_unit
-create test/controllers/articles_controller_test.rb
+create    test/controllers/articles_controller_test.rb
 ...
 ```