You will find a number of good ones on this very site The DMT Nexus - Files for free no less.

I haven't read any that were worthless, tbh.  The basic techniques for beginners are rather simple to explain, but take time to see results.  There are plenty of people who learn about lucid dreaming, and bam have a full blown lucid dream that very night.  But there are also a very large number of people who try and try for months and can't seem to do it.

My opinion on the matter is this has to do with a number of factors, most important being that people simply don't remember their dreams in any significant amounts.  Even if you wake up remembering a few vivid dreams, this is only a tiny percentage of your actual dreaming.  Thus, it is likely that most people have actually already had any number of lucid dreams and simply not remembered them upon awakening.

There is a decent series of free videos on YouTube called lucidology 101 (search You Tube and you should find 10 or so videos)... this is a pretty good introduction to what was at one time a very mysterious and advanced practice in the LD world, WILDing.  Wake Induced Lucid Dreaming is where you go consciously and directly from waking into the dream state and stay lucid the whole time, thus eliminating the necessity of waking up within the dream.  Very cool if you can pull it off, and it dovetails with another advanced esoteric practice... that of astral projection and OOBEs.

At any rate, there is an overabundance of info on both subjects and their overlap if you have interest.  There has probably been no time in human history where such powerful information was so widely available. 

Good luck

HF