I like joachim33's list.
You're kind of in luck, detwidkul, because most methods seem to devote at least twice as much space to LH compared to RH technique, as well they should, if only because of the risk of injury. That may be one reason why there's more discussion of the RH around here.
The best tip I have is to learn the fundamentals from a qualified teacher who can monitor and guide you in real time. In person best, but I think these days video can suffice. (I'm not a professional teacher, so there's no conflict of interest here; and by the same token, take my advice with a grain of salt.)
My next tip is to diligently review and monitor these fundamentals as you advance, because they are the key to everything else, including speed, strength, agility, and fluidity. I benefit greatly every time I review them with any seriousness. That's why a teacher is important, because the fundamentals affect everything else.
And the most important of these, IMO, is Relaxation. Even many methods neglect this key LH (and RH) skill--active, purposeful, insistent and instantaneous relaxing. If you want to be able to play fast, learn how to relax fast. For your hands to relax, your arms, shoulders, body, neck must all be in balance, floating, free of tension. The role of the arm in positioning and supporting the fingers and thus allowing the hand to relax should not be underestimated or neglected.
Know and heed the warning signs: pain, effort, tension; do not confuse these with the exertions of a hand doing what it is designed to do. The goal is *effortless* playing. Someone around here coined a term--something like "intelligent laziness". Technique is a puzzle where the goal is to accomplish X in the easiest, most comfortable and natural way possible (which most always turns out to confer speed as a benefit as well).
If a teacher is really impossible, there are so many methods freely accessible now, and demonstrations on youtube, that there is no reason not to cross-reference several soruces on such basics. It's tricky, though, because in the beginning the path to ease involves a lot of effort as one trains and develops the hands and the senses for unfamiliar tasks.