When beginners start learning judo, they are usually taught a whole range of techniques. Unfortunately, they are usually not taught how to form a family of techniques that work together seamlessly. As a result, players will often have a mishmash of techniques.

It's good to pursue techniques that you like but if they are disparate and do not relate to each other at all, you won't succeed in building up an effective attacking system. In order to do that,  you need cohesiveness in your judo.

It all starts off with stance and grips. I've seen so many players switch from right to left stance and vice versa. You need to pick a stance and stick to it. Usually, the stance is the one that you are naturally inclined towards. If you're a right-hander, it makes sense to have a right-hand stance.

However, there are coaches who believe it's better to fight left-handed (because most players are right-handed) so they force or urge their players to learn to become a lefty.

That's okay if you are willing to be disciplined about fighting left-sided. But if you are uncomfortable with it, better stick to being a right-hander rather than switching back and forth between left-handedness and right-handedness.

Once you've decided on your stance, you need to decide on a grip. Perhaps you might like a high-gripping styel. Or perhaps you are more traditional and prefers a more classical sleeve-lapel grip. Or you might be very radical and want to fight off a Georgian-style belt grip.

Whatever you decide on, you need to build your family of techniques around your stance and your grip.

There are four quadrants in judo: sleeve front, lapel front, sleeve back and lapel back. Ideally, you should have a throw to each corner, that can be done without changing your stance and your grip.

Once  you have worked out your quadrant throws, you need to learn how to bring them together for combination attacks, either renraku-waza (opposite directions) or renzoku-waza (same direction).

In addition to combination attacks, you should also learn how to develop a series of action-reaction feints. For example, you threaten to throw uke to the front with uchimata but instead, take them backwards with a kosoto-gari (this movement is commonly known as The Twitch).  

If you can achieve all that I've described above, you have cohesive judo and you would then be well on your way towards achieving mastery. It's important to have cohesive judo. Without it, there's no mastery.