Newbie With Questions & Pics

This is my first attempt at growing a plant. I need some help, the bottom leave are yellow and the stem is reddish/purple. What could be the cause of this? How can I get it on the right path for a healthy grow? Thanks ahead of time for any input/suggestions.

Start here:

https://www.rollitup.org/newbie-central/

Read, read, read.

Then read some more..

Good luck.

yo you using what type of dirt?
Thinking yo got da wrong dirt~

more heat, more light and less water mate.