You've heard mixed reviews of whether core strengthening is a viable option for treating and/or preventing low back pain in your patients...
The truth is, it's one of many treatment options, and not necessarily more effective than others...
That said...in my book, learning to properly activate the core along with improving core endurance and strength, is an absolute necessity for improving your patients' function.
Here is an article that puts 'core strengthening' in simple, relatable terms - with evidence to back it. There's also easy-to-follow instructions and videos for abdominal bracing and other exercises...