diff --git a/fp.md b/fp.md
new file mode 100644
index 0000000..a9fd4fa
--- /dev/null
+++ b/fp.md
@@ -0,0 +1,59 @@
+# Understanding f32 and f64 in Rust
+
+## Overview
+
+Rust provides two floating-point types: `f32` (32-bit) and `f64` (64-bit). Both follow the IEEE 754 standard for floating-point arithmetic.
+
+## Key Differences
+
+### Precision
+
+- `f32`: Single precision, ~6-7 decimal digits of precision
+- `f64`: Double precision, ~15-17 decimal digits of precision
+
+### Memory Usage
+
+- `f32`: 4 bytes
+- `f64`: 8 bytes
+
+### Range
+
+- `f32`: ±3.4E+38 to ±3.4E-38
+- `f64`: ±1.8E+308 to ±2.2E-308
+
+### Use Cases
+
+#### f32 is preferred when:
+
+- Working with graphics and game development
+- Memory is constrained
+- Performance is critical
+- Full double precision isn't necessary
+- Working with hardware that natively uses 32-bit floats
+
+#### f64 is preferred when:
+
+- Higher precision is required
+- Working with scientific calculations
+- Dealing with large numerical ranges
+
+### Performance Considerations
+
+- `f32` operations are generally faster
+- Modern CPUs might handle `f64` just as efficiently
+- `f32` arrays use less cache space
+- SIMD operations can process more `f32` values simultaneously
+
+### Common Pitfalls
+
+1. Precision loss in `f32` during complex calculations
+2. Comparison issues due to floating-point rounding
+3. Accumulated errors in long calculation chains
+4. Platform-dependent behavior
+
+## Best Practices
+
+1. Use `f64` by default unless you have specific reasons not to
+2. Avoid direct equality comparisons
+3. Consider using decimal types for financial calculations
+4. Document precision requirements in your code
diff --git a/pointer.md b/pointer.md
new file mode 100644
index 0000000..e69de29
diff --git a/src/charac.rs b/src/charac.rs
new file mode 100644
index 0000000..a9477af
--- /dev/null
+++ b/src/charac.rs
@@ -0,0 +1,16 @@
+pub fn char_string() {
+    let make_string: String = make_string("martin", "19");
+    println!("my name is {}", make_string);
+}
+
+pub fn make_string(x: &str, y: &str) -> String {
+    format!("{x} and i scored {y}")
+}
+
+pub fn intro_to_ownable_string() {
+    let mut fname: String = String::from("martin");
+    println!("first name: {} {}", fname, fname.len());
+
+    fname.push_str("vibes");
+    println!("first name_______: {} {}", fname, fname.len());
+}
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diff --git a/src/floating_points.rs b/src/floating_points.rs
new file mode 100644
index 0000000..ef27edc
--- /dev/null
+++ b/src/floating_points.rs
@@ -0,0 +1,15 @@
+pub fn floating_num() {
+    let floating_sum: f32 = floating_sum(3.6, 8.8);
+    let floating_substrt: f32 = floating_substrt(24.6, 8.8);
+
+    println!("floating_sum result is {}", floating_sum);
+    println!("floating_sum result is {}", floating_substrt);
+}
+
+pub fn floating_sum(x: f32, y: f32) -> f32 {
+    x + y
+}
+
+pub fn floating_substrt(x: f32, y: f32) -> f32 {
+    x - y
+}
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
index 3cc3d3e..42273df 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,24 +1,13 @@
-fn main() {
-    intro_to_u();
-}
-
+mod floating_points;
+mod charac;
+mod signed_integer;
+mod unsigned_integer;
 
-// function to encapsulate all integers
-fn intro_to_u() {
-    let sum_result: u8 = sum(5, 10);
-    println!("the sum result is: {}", sum_result);   
-
-
-}
+fn main() {
+    floating_points::floating_num();
+    charac::intro_to_ownable_string();
+    charac::char_string();
+    signed_integer::signed_int();
+    unsigned_integer::unsigned_int();
 
-fn sum(x: u8, y: u8) -> u8 {
-    x + y // implicit return
-//    return x + y; // explicit return
 }
-
-
-// subtract
-// multiplication
-// division
-
-
diff --git a/src/signed_integer.rs b/src/signed_integer.rs
new file mode 100644
index 0000000..0f34323
--- /dev/null
+++ b/src/signed_integer.rs
@@ -0,0 +1,28 @@
+pub fn signed_int() {
+    let result_sum: i32 = sum(10, 7).into();
+    let result_substrt: i32 = substraction(23, 17);
+    let result_division: i32 = division(25, 5);
+    let result_multiply: i32 = multiply(23, 17);
+
+    println!("The sum result is {}", result_sum);
+    println!("The result is {}", result_substrt);
+    println!("The result is {}", result_division);
+    println!("The result is {}", result_multiply);
+}
+
+pub fn sum(x: i32, y: i32) -> i32 {
+    x + y
+    // return x + y; // explicit return
+}
+
+pub fn substraction(x: i32, y: i32) -> i32 {
+    x - y
+}
+
+pub fn division(x: i32, y: i32) -> i32 {
+    x / y
+}
+
+pub fn multiply(x: i32, y: i32) -> i32 {
+    x * y
+}
\ No newline at end of file
diff --git a/src/unsigned_integer.rs b/src/unsigned_integer.rs
new file mode 100644
index 0000000..8756800
--- /dev/null
+++ b/src/unsigned_integer.rs
@@ -0,0 +1,28 @@
+pub fn unsigned_int() {
+    let result_sum: u32 = sum(10, 7).into();
+    let result_substrt: u32 = substraction(23, 17);
+    let result_division: u32 = division(25, 5);
+    let result_multiply: u32 = multiply(23, 17);
+
+    println!("The sum result is {}", result_sum);
+    println!("The result is {}", result_substrt);
+    println!("The result is {}", result_division);
+    println!("The result is {}", result_multiply);
+}
+
+pub fn sum(x: u32, y: u32) -> u32 {
+    x + y
+    // return x + y; // explicit return
+}
+
+pub fn substraction(x: u32, y: u32) -> u32 {
+    x - y
+}
+
+pub fn division(x: u32, y: u32) -> u32 {
+    x / y
+}
+
+pub fn multiply(x: u32, y: u32) -> u32 {
+    x * y
+}
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