mIf you are playing a Jedi Knight in SWTOR, there are a few SWTOR Jedi Knight builds you can choose from depending on what role you want to fill. Really, there is a lot of stuff to do in Star Wars The Old Republic, so you have to tailor your build towards the events you want to participate in.
First off, as an SWTOR Jedi Knight, you can pick to be either a Sentinel or Guardian. If you are still leveling up, the best builds involve the Sentinel class, which focuses in on damage, so you will want to pick a Sentinel. Pretty much any build you can come up with that involves the Sentinel will be great for leveling up, it doesn’t really matter what you do.
Now, if you want to tank though, you will need to be a lot more specific about your choices. You have to be a Guardian in order to tank, and more specifically you need to put all your talent points in the tanking talent tree. You can even put some in the shared talent tree, as this particular tree really does focus in on maximizing the utility of this class. It can help you tank better by snaring the opponent and increasing your own mobility.
However, if you want to participate in something like PvP, all bets are off. You really have to decide what particular role you want to fill in PvP before you can decide on a specific build. What I mean by this is that if you want to be the ball carrier for example, you will actually want to be a Guardian. If you want to be a damage dealer that takes down healers and casters, you really need to put more points into Sentinel since this classes focuses in on taking down your opponent.
However, many players have recommended trying out all sorts of SWTOR Jedi Knight builds so you have a good idea of what each class and specialization brings to the table. Once you do that, not only will you have a better understanding of which talents to pick for your specific role but also how to counter other Jedi Knights you might encounter in PvP.