1. The First Four Strings are the Same
First of all, the first step is already covered. A guitarist should know his/her way around the fret board, if not with all four strings, at least the first two. When I picked up the bass, I was surprised to how easy it was because I already knew where to find root notes. This is a bass-ic start (no pun intended)
2. Knowing Guitar Helps Bass and Knowing Bass Helps Guitar
What I found playing more bass is that when I went back to guitar, I began hearing bass lines. This kind of new music brain will allow you to be a better song writer. You become more aware of what bass, melody and rhythm parts could sound like all together. You begin to have more complex audiation and have more ideas.
3. You Get to Know Your Chromatic Scales
An essential part to bass lines is simple chromatic scales. A chromatic scale is playing half steps or semi tones consecutively. Simply just one note after the other. Knowing how to use these properly is valuable in both bass and guitar and can contribute a unique effect to certain progressions.
4. You Get to Know Your Octaves
One of the first tricks you'll learn in bass is octaves. This is a very useful tool for adding some attitude to your playing. As for guitar, it is useful to know your octaves so that you can find notes easier. Typically the root note is a good reference point when you begin a solo. Knowing octaves allows you to find different root notes, which takes you to different zones on the guitar which allows you to play different melodies, giving you a grand treasure chest of shredding gold! The diagram to the right shows where to find octaves on bass. It is simple: It is a 2 string jump and a 3 fret spread.
5. You Get to Know "The Grove"
The grove is defined as "a rhythm pattern in popular or jazz music" In my opinion, the internet has a pretty lousy definition of what the grove means. The grove is finding the right pocket, it is playing at the right time. As a bassist, you want to pay attention to the drummer, especially when they hit the snare. The grove is constructed by many things such as your timing, emphasis and technique.
6. You are an Asset to a Jam
One of the most common situations I have run into in my jam experience is needing a bassist. So often there are too many stars lined up and no bass player on site. Multi - instrumentalists are highly appreciated in this scenario. If once in a while your willing to take a step back, it can be lot's of fun!