diff --git a/src/concepts/box_basics.rs b/src/concepts/box_basics.rs
new file mode 100644
index 0000000..9b29ffc
--- /dev/null
+++ b/src/concepts/box_basics.rs
@@ -0,0 +1,14 @@
+fn box_integer(number: i32) -> Box<i32> {
+    Box::new(number)
+}
+
+fn box_function() -> Box<fn(i32) -> Box<i32>> {
+    Box::new(box_integer)
+}
+
+pub fn box_basics() {
+    let boxed_int = box_integer(3);
+    let boxed_boxer = box_function();
+    let another_boxed_int = boxed_boxer(4);
+    print!("Box basics: {} {}", boxed_int, another_boxed_int);
+}
diff --git a/src/concepts/mod.rs b/src/concepts/mod.rs
new file mode 100644
index 0000000..e63aab8
--- /dev/null
+++ b/src/concepts/mod.rs
@@ -0,0 +1,3 @@
+mod box_basics;
+
+pub use box_basics::box_basics;
diff --git a/src/lib/libmy_lib.rlib b/src/lib/libmy_lib.rlib
new file mode 100644
index 0000000..aca12a7
Binary files /dev/null and b/src/lib/libmy_lib.rlib differ
diff --git a/src/main.rs b/src/main.rs
index 2f42dd4..2c0d2df 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -14,8 +14,9 @@
 // mod controlflow;
 // mod traits;
 // mod str_types;
-mod functions;
+// mod functions;
 // mod exercises;
+mod concepts;
 
 fn main() {
     // helloworld::hello_world_module();
@@ -27,6 +28,8 @@ fn main() {
     // controlflow::control_flow_module();
     //traits::traits_exercise();
     // str_types::str_types_module();
-    functions::functions_module();
     // exercises::run_easy();
+    // my_lib::public_function();
+    // functions::functions_module();
+    concepts::box_basics();
 }
diff --git a/src/my_lib.rs b/src/my_lib.rs
new file mode 100644
index 0000000..e2468ad
--- /dev/null
+++ b/src/my_lib.rs
@@ -0,0 +1,8 @@
+pub fn public_function() {
+    println!("This is a public funcion that calls a private one!");
+    private_function();
+}
+
+fn private_function() {
+    println!("This is a private function!");
+}