My opinion is that the standard advice of "Do more tactical puzzles" is *not* what very low rated players need. Such puzzles are *clever* and usually require lookahead of 3-5 or more moves, so they are aimed at people rated say 1500 and higher. Very low rated players very frequently miss 1-move shots that win entire pieces or even produce checkmates, which are moves that are too obvious for players who enjoy clever puzzles.
My advice is to play against a computer set at a low level, then gradually increase its level. I thought I was a good player until I started playing against programs, then I discovered that I was overlooking simple tactical wins at almost every move--tactics that the program never missed. The computer whipped me into shape quickly! It also taught me a valuable lesson, which in retrospect should have been obvious: Unlike computers, people make tactical mistakes, *frequently*, so in chess games against people that means one should look for a tactical refutation at every move.
P.S.--I also disagree with the common advice to ignore learning openings when very low rated. My opinion is that a player should learn all aspects of play at once, though in small, gradual doses: tactics, strategy, openings, endgames, middlegames.


Fairly typical advice to beginners wanting to improve include guidance like do many tactics puzzles, just try to stick to basic opening principles, play tougher opponents, analyze your lost games, etc.
After that, details of advice seem to vary wildly. Do 5 tactics a day vs 100. Play slowly, but not *too* slowly. Beginners don't know how to analyze games, so different approaches are suggested.
So what I wonder is how much the details matter to a beginner trying to a more "advanced beginner" level of play.
If someone rated 900-1100 (me over the last month) tries to think about moves before making them (imagining a few of the more obvious possible opponent replies), tries to reduce the blunder count, does somewhere between 5 and 100 tactics puzzles a day (passing/failing at whatever rate), works through Chess Mentor or some other tutorials, etc., I bet that beginner will see some general signs of improvement (as I have in the last month).
Now that I've been at this a bit, I'm starting to get a *hint* of an idea of how I should refine the process, although I bet a month from now I'll disagree with my current opinion. Despite this, future me will be playing a little better.
I only play correspondence time controls, so I have the luxury of playing around with ideas more than someone playing blitz, but I suspect the same general rules of thumb apply.
The people I play OTB with at the office aren't doing tactics drills or anything formal to improve. But one guy I beat in every game seems to be getting better just playing against me repeatedly. I do tell him things like how I play the opening (a pawn or two to the center, 2 knights out, then bishops to reasonable looking central squares, not moving any piece twice, then castle kingside), and he tries to play to target this pattern.
Am I right? If you don't aspire to OTB tournament play, is haphazard daily study & play good enough to graduate from embarassingly bad to decent enough for the office?