The Conjunction is where planets appear next to each other as seen from the Earth. Conjunctions are very powerful because the two or more planets are involved. They work as a team and combine their energies.
The Sextile is an angle between planets that are 60 degrees from each other. The Sextile is harmonious, like the trine.
The trine is an aspect formed when planets are three signs apart, or about 120 degrees apart. It represents luck on the path of life.