diff --git a/src/Development/Go/README.md b/src/Development/Go/README.md
index 8b16745..077bb13 100644
--- a/src/Development/Go/README.md
+++ b/src/Development/Go/README.md
@@ -1,9 +1,9 @@
 # Go
 
-| Distribution | Package                                         |
-| ------------ | ----------------------------------------------- |
-| Arch Linux   | `go`, `go-tools`                                |
-| Ubuntu       | [See](https://github.com/golang/go/wiki/Ubuntu) |
+| Distribution | Package          |
+| ------------ | ---------------- |
+| Arch Linux   | `go`, `go-tools` |
+| Snap         | `go`             |
 
 Add to `~/.bashrc`:
 
diff --git a/src/Development/Go/strings.md b/src/Development/Go/strings.md
new file mode 100644
index 0000000..64a3cf6
--- /dev/null
+++ b/src/Development/Go/strings.md
@@ -0,0 +1,9 @@
+# [strings](https://golang.org/pkg/strings/)
+
+Replace list of strings by using Replacer:
+
+```go
+template := "My city is {city} and my country is {country}"
+r := strings.NewReplacer("{city}", "Sai Gon", "{country}", "Viet Nam")
+fmt.Println(r.Replace(template))
+```
diff --git a/src/Development/Python/tarfile.md b/src/Development/Python/tarfile.md
new file mode 100644
index 0000000..565290b
--- /dev/null
+++ b/src/Development/Python/tarfile.md
@@ -0,0 +1,11 @@
+# [tarfile](https://docs.python.org/3/library/tarfile.html)
+
+```python
+# Read then extract
+with tarfile.open(path_to_tarfile) as tar:
+    tar.extractall(path_to_extract)
+
+# Create a gzipped archive from file
+with tarfile.open(path_to_archive, "w:gz") as tar:
+    tar.add(path_to_file, arcname=filename_inside_archive)
+```
diff --git a/src/SUMMARY.md b/src/SUMMARY.md
index 931dbf8..ca96ec1 100644
--- a/src/SUMMARY.md
+++ b/src/SUMMARY.md
@@ -42,6 +42,7 @@
   - [ANTLR](Development/ANTLR/README.md)
     - [Condition](Development/ANTLR/Condition.md)
   - [Go](Development/Go/README.md)
+    - [strings](Development/Go/strings.md)
     - [testing](Development/Go/testing.md)
     - [time](Development/Go/time.md)
   - [Python](Development/Python/README.md)
@@ -49,6 +50,7 @@
     - [black](Development/Python/black.md)
     - [subprocess](Development/Python/subprocess.md)
     - [venv](Development/Python/venv.md)
+    - [tarfile](Development/Python/tarfile.md)
   - [Services](Development/Services/README.md)
     - [Consul](Development/Services/Consul.md)
     - [Grafana](Development/Services/Grafana.md)