Yep with one exception.
For short trips that may be all you need. But if you are going longer or perhaps interstate freeways at higher speeds you may want to secure the rear as well to prevent it from bouncing and moving side to side. Some will use 2 additional straps one on each side. Personally, I use 1. I hook it on one side, pass it through the rear wheel and secure it to the other side. Tightened enough such that the wheel is held to the deck.

Basically the answer depends on the trailer. If you are asking so that you can set up your trailer and bike then many have provided good answers. but in real life you might be loading a bike (yours or not) on a strange trailer. That means different options.

The above picture shows clearly the best method. First, not on the side stand. You want to get a strap on each side of the front, not too high, but not too low either. This keeps the front from turning, tipping, and bouncing. Ideally, the straps will go down, slightly forward, and out to the sides. Forward angle keeps the bike from rolling back. A wheel chock is preferred but not required. Kenny94945 mentioned bring the front wheel all the way to the front, but if you have a fender that sticks out past the tire like on a touring bike you run the risk of crushing the fender on the trailer wall. SO, if no wheel chock, use a chunk of wood between the wall and tire to close the gap.
You tighten the front straps enough to partially compress the front (the amount varies by opinion). My opinion is enough so that the weight of the bike standing free form when you get off is contained by the compression. The straps should also be tightened evenly such that the bike isn't leaning.

 

With my old Honda VTX I have also screwed a couple of pieces of 2 x 4 to the deck on either side of the front wheel to hold it in place. Worked in a pinch.

 

 

I don't know...but I could watch this instructional video all day...

 

I trained mine to "STAY", hence no need to tie down.

 

Been tying them down for 47 years. Not a problem during that whole time.
2 straps for lightweight bikes (<230lbs.)
4 straps for everything else.

 

 

Another vote for the biker bar. Pricey but the only attachment you will need and only touches the bottom of the frame. Very slick setup and glad I went that route.

 

That's what I have in my trailer. No pressure points on front end.

 

Dont use ratchet straps, Use cam lock straps instead. I have a set of SRT for my dirtbike and they work better than the ratcheting type and you have less strap to deal with also. The best places is any hard part like your fork or saddlebag guards.