while what I do typically has very little bearing on the "right" way to do things, I use a chain in the back, hooked onto two tiedown points on the trailer, with the middle attached to the rear center tow hook with a clevis/caribeener thingy

two ratchet straps in the front complete the deal. It's worked great for the past few years.

also, in my first year of towing, I used chains front and rear, one in the back, the same as I am now, and two in the front, using chain tensioners to compress the car's suspension and keep it very tight