1 VGA - VGA is an analog output, and was most common in the CRT-era of computer displays. It has largely been phased out of any recent hardware, but you may encounter it with older computers or CRT monitors.  DisplayPort - This is a digital connection, similar to HDMI.
There is evidence that iron was known from before 5000 BCE. The oldest known iron objects used by humans are some beads of meteoric iron, made in Egypt in about 4000 BCE. The discovery of smelting around 3000 BCE led to the start of the iron age around 1200 BCE and the prominent use of iron for tools and weapons.
Iron Age Kingdom: Iron Smelting in Africa- Bonus Blog Post. The Iron Age of Africa is generally considered to have taken place between 200 AD and 1000 AD when iron smelting was a practice. In Africa, the Iron Age was not prefaced by the Bronze or Copper Age, instead, all of the metals were brought together. The advantages of Iron are obvious, easier to cut trees with and easier to shave stone. In the 2nd millenium BC, it is believed that Western Asians invented the process of iron smelting.