This level is for people who are new to music and want to get a feel of the bass guitar. This level will go over some genres and will take you to the next level.
This level is where you will start to make some good progress and start looking into more difficult genres which involves more effort put into them.
This level is for people looking to possibly study music in the future as this level is great for covering most genres and all kinds of techniques.
This is where it starts to get difficult and requires time to be able to play, this level will cover everything done in higher but at a higher difficulty level.
Make sure you learn theory first!
Here is a collection of some classic demos which you can watch to not only listen to the bass parts but look at how it is played..