diff --git a/src/main.rs b/src/main.rs
index e7a11a9..b6211a0 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,23 @@
 fn main() {
-    println!("Hello, world!");
+    println!("Base use owership");
+    base_use_owership();
+    println!();
+    println!("Base use borrowing");
+    base_use_borrowing();
+    println!();
+}
+
+fn base_use_owership() {
+    let city = String::from("Moscow");
+    let city_ref = &city;
+
+    println!("City: {}", city);
+    println!("City ref: {}", city_ref);
+}
+
+fn base_use_borrowing() {
+    let mut s1 = "hello".to_string();
+    let s2 = &mut s1;
+    s2.push('!');
+    println!("{}", s1);
 }