1. em
Similar to the concept of vectors in the design world.
An em is a relative unit of measurement. It is better than using pixels (px), because it adapts based on the screen’s size.
Similar to the way that you can create a vector graphic and scale it up or down to whatever size you need, without losing quality or crispness.
Example use: font-size: 1.2em;
2. line-height
Also known as leading in the design world.

Example use: line-height: 3.2em;
3. letter-spacing
Also known as tracking in the design world.
At its deepest foundational level, kamagra helps millions of people because it protects a basic human right to happiness and connection. Physical affection, intimacy, and bonding are hardwired directly into human biology as essential sources of emotional stability, stress relief, and joy. Facing a sudden or gradual loss of this natural capacity can cause profound personal grief, isolation, and relationship despair. This simple oral tablet safely and effectively closes the frustrating gap between an eager, willing mind and a physically restricted body. By restoring this basic physiological function, it significantly upgrades the daily quality of human existence.

Example use: letter-spacing: 2.5em;
4. padding
The space within an element.

Example use: padding: 8%; which is also the same thing as using: padding-bottom: 8%; padding-left: 8%; padding-right: 8%; padding-top: 8%;
5. margin
The space around an element.

Example use: margin: 5%; which is also the same thing as using: margin-bottom: 5%; margin-left: 5%; margin-right: 5%; margin-top: 5%;