diff --git a/config.toml b/config.toml
index 4f2d033..4433e0f 100644
--- a/config.toml
+++ b/config.toml
@@ -47,7 +47,6 @@ menu_items = [
 	{url = "$BASE_URL/tags", name = "Tags (EN)"},
 	{url = "$BASE_URL/pt/tags", name = "Tags (PT)"},
 	{url = "$BASE_URL/quotes", name = "Quotes"},
-	{url = "$BASE_URL/research", name = "Research Notes"},
 ]
 after_dark_title = "JulioBiason.Net 4.1"
 enable_post_view_navigation = false
diff --git a/content/research/_index.md b/content/research/_index.md
deleted file mode 100644
index 306be92..0000000
--- a/content/research/_index.md
+++ /dev/null
@@ -1,5 +0,0 @@
-+++
-title = "Research Notes"
-transparent = false
-sort_by = "weight"
-+++
diff --git a/content/research/elastic.md b/content/research/elastic.md
deleted file mode 100644
index 8f36919..0000000
--- a/content/research/elastic.md
+++ /dev/null
@@ -1,34 +0,0 @@
-+++
-title = "ElasticSearch"
-weight = 101
-
-[taxonomies]
-tags = ["research", "elastic", "elasticsearch", "docker"]
-+++
-
-## Docker image
-
-```
-docker pull docker.elastic.co/elasticsearch/elasticsearch:7.8.0
-```
-
-## Start
-
-```
-docker run -p 9200:9200 -p 9300:9300 -e "discovery.type=single-node" docker.elastic.co/elasticsearch/elasticsearch:7.8.0
-```
-
-- Port 9200: REST interface.
-- Port 9300: Inter-node communication.
-- `discovery.type`: Just one node, no discovery needed.
-
-## Definitions
-
-- MySQL => Databases => Tables => Columns/Rows
-- Elasticsearch => Indices => Types => Documents with Properties
-
-## Adding information (REST)
-
-```
-POST /<index>/_doc/
-```
diff --git a/content/research/java.md b/content/research/java.md
deleted file mode 100644
index 4717aaf..0000000
--- a/content/research/java.md
+++ /dev/null
@@ -1,7 +0,0 @@
-+++
-title = "Java"
-weight = 106
-+++
-
-- [Shell With All Maven Classes](@/research/java/maven-shell.md)
-- [Abstract Classes Resolution Order](@/research/java/abstract.md)
diff --git a/content/research/java/abstract.md b/content/research/java/abstract.md
deleted file mode 100644
index 30e89e0..0000000
--- a/content/research/java/abstract.md
+++ /dev/null
@@ -1,3 +0,0 @@
-+++
-title = "Java: Abstract Classes Resolution Order"
-+++
diff --git a/content/research/java/maven-shell.md b/content/research/java/maven-shell.md
deleted file mode 100644
index c4b3491..0000000
--- a/content/research/java/maven-shell.md
+++ /dev/null
@@ -1,10 +0,0 @@
-+++
-title = "Shell with All Maven Classes"
-+++
-
-```
-alias mvn-shell='jshell --class-path $(find ~/.m2/repository/ -name "*.jar" | tr "\n" ":")'
-```
-
-This alias loads all classes in the Maven (m2) repository and make them
-available to the shell.
diff --git a/content/research/psql.md b/content/research/psql.md
deleted file mode 100644
index 0e1b9bc..0000000
--- a/content/research/psql.md
+++ /dev/null
@@ -1,31 +0,0 @@
-+++
-title = "psql"
-weight = 112
-
-[taxonomies]
-tags = ["research", "postgresql", "psql", "database", "schema", "table"]
-+++
-
-## Show Database
-
-```
-\l
-```
-
-## Use Database
-
-```
-\c [database_name]
-```
-
-## Show Schemas
-
-```
-\dn
-```
-
-## Show Tables
-
-```
-\dt
-```
diff --git a/content/research/sql.md b/content/research/sql.md
deleted file mode 100644
index 5bf24ed..0000000
--- a/content/research/sql.md
+++ /dev/null
@@ -1,14 +0,0 @@
-+++
-title = "SQL"
-weight = 115
-+++
-
-- [Cross Join](@/research/sql/cross-join.md)
-- [Except](@/research/sql/except.md)
-- [Fetch First](@/research/sql/fetch-first.md)
-- [Inner Join](@/research/sql/inner-join.md)
-- [Join Using](@/research/sql/join-using.md)
-- [Left Join](@/research/sql/left-join.md)
-- [Right Join](@/research/sql/right-join.md)
-- [Row_Number()](@/research/sql/row_number.md)
-- [Select Over](@/research/sql/over.md)
diff --git a/content/research/sql/cross-join.md b/content/research/sql/cross-join.md
deleted file mode 100644
index bf2c91e..0000000
--- a/content/research/sql/cross-join.md
+++ /dev/null
@@ -1,3 +0,0 @@
-+++
-title = "SQL: Cross Join"
-+++
diff --git a/content/research/sql/except.md b/content/research/sql/except.md
deleted file mode 100644
index 12a0428..0000000
--- a/content/research/sql/except.md
+++ /dev/null
@@ -1,3 +0,0 @@
-+++
-title = "SQL: Select Except"
-+++
diff --git a/content/research/sql/fetch-first.md b/content/research/sql/fetch-first.md
deleted file mode 100644
index 5c79dae..0000000
--- a/content/research/sql/fetch-first.md
+++ /dev/null
@@ -1,4 +0,0 @@
-+++
-title = "SQL: Fetch First"
-+++
-
diff --git a/content/research/sql/inner-join.md b/content/research/sql/inner-join.md
deleted file mode 100644
index e5ebdd5..0000000
--- a/content/research/sql/inner-join.md
+++ /dev/null
@@ -1,3 +0,0 @@
-+++
-title = "SQL: Inner Join"
-+++
diff --git a/content/research/sql/join-using.md b/content/research/sql/join-using.md
deleted file mode 100644
index 2a4cfac..0000000
--- a/content/research/sql/join-using.md
+++ /dev/null
@@ -1,3 +0,0 @@
-+++
-title = "Join Using"
-+++
diff --git a/content/research/sql/left-join.md b/content/research/sql/left-join.md
deleted file mode 100644
index 1d30ea6..0000000
--- a/content/research/sql/left-join.md
+++ /dev/null
@@ -1,3 +0,0 @@
-+++
-title = "SQL: Left Join"
-+++
diff --git a/content/research/sql/over.md b/content/research/sql/over.md
deleted file mode 100644
index c194283..0000000
--- a/content/research/sql/over.md
+++ /dev/null
@@ -1,3 +0,0 @@
-+++
-title = "SQL: Select Over"
-+++
diff --git a/content/research/sql/right-join.md b/content/research/sql/right-join.md
deleted file mode 100644
index 30b4a57..0000000
--- a/content/research/sql/right-join.md
+++ /dev/null
@@ -1,3 +0,0 @@
-+++
-title = "SQL: Right Join"
-+++
diff --git a/content/research/sql/row_number.md b/content/research/sql/row_number.md
deleted file mode 100644
index dc3e557..0000000
--- a/content/research/sql/row_number.md
+++ /dev/null
@@ -1,5 +0,0 @@
-+++
-title = "SQL: Function `row_number`"
-+++
-
-