There is a lot of information related to all things bass and music buried within this site. This page makes sure you know exactly where to go to find the good stuff.
This is a great one to start with: 100 Pro Tips To Improve your Bass Playing.
It shouldn't be a surprise from the name of this site that it provides organised, well presented courses for bass players. Those can be found on the courses page. There are 7 free courses which can be followed at your own leisure. All PDFs and backing tracks are right there next to the lesson for you to download when you want.
The blog contains lots of categories that are focused on learning useable material you can use straight away. Feel free to go straight there and discover for yourself what's there by clicking through the category links in the sidebar.
Below is a selection of some of my best lessons in each category.
Also, if you haven't done so already, download my free 29 page ebook. It contains scale shapes, modes, arpeggios, harmonics, chords, and tons of other stuff that will really help you. There are video lessons that go with it to. Go here to signup.
If you're a beginner, start with these:
Intermediate players looking to brush up on a few things could do with going over much of this material too. As a matter of fact, I hate the terms beginner, intermediate and advanced. You can be a beginner and know how to use modes and you can be advanced and not know how to groove. These definitions are only useful if you really don't know where to start, otherwise the best way is to have an open mind and a willingness to learn anything and everything that is going to make you improve.
Many of the following lessons are found in the free courses. Here they are as standalone lessons.
There are many more lessons, exercises and tips - all of them in the lessons section of the site. You can browse by categories there to find something you can work on. Use the search bar to see if something you want to learn is here. If it's not, get in contact if you want to suggest a lesson!
LEarning From the greats
The best and most fun way to learn is by listening to the greatest bass playing of all time, and there have been plenty of that since Leo Fender popularised the electric bass in 1951.