* [Bass Musician Magazine](https://www.bassmusicianmagazine.com) has a series of articles on soloing, including a beginner's guide, tips for improvisation, and more.
* [Learn Jazz Standards](https://learnjazzstandards.com) has a number of lessons on soloing over jazz standards, which can be a great way to develop your soloing skills.
* [Bass Players United](https://bassplayersunited.com) has a forum where you can ask questions and get feedback from other bass players.
Online courses
* [Berklee Online](https://online.berklee.edu) offers a number of bass guitar courses, including some that focus on soloing.
* [TakeLessons](https://takelessons.com) offers online bass guitar lessons, including some that focus on soloing.
* [Udemy](https://www.udemy.com) offers a number of bass guitar courses, including some that focus on soloing.
Books
* [The Bassist's Bible](https://www.amazon.com/Bassists-Bible-Ultimate-Reference-Manual/dp/1476858440) by Hal Leonard is a comprehensive guide to all aspects of bass playing, including soloing.
* [Soloing for Bassists](https://www.amazon.com/Soloing-Bass-Gary-Willis/dp/0634015049) by Gary Willis is a book that focuses specifically on soloing for bass guitar.
* [Improvising Jazz Solos on the Bass](https://www.amazon.com/Improvising-Jazz-Solos-Bass-Musicians/dp/0912483550) by Ed Friedland is a book that teaches jazz soloing techniques for bass guitar.
Workshops and clinics
* Many music stores and music schools offer bass guitar workshops and clinics, which can be a great way to learn how to solo and get feedback from experienced players.
* Bass Player Live and Bass Bash are two major bass guitar conventions that offer a variety of workshops and clinics on soloing.
Take private lessons
* If you want to learn how to solo on bass guitar quickly and effectively, taking private lessons from an experienced bass player is a great option. A private instructor can assess your current skill level and design a customized lesson plan that will help you reach your goals.