I dont really know much about reading the aspect patterns in my chart, but I found out that I have two grand trines in my chart. Can anyone tell me the meaning of my grand trines?
Grand trines can mean lots of different things. In addition to what Horus said, your grand trine means the planets involved in it are a team. Whatever satisfies your moon also satisfies your Mars and Neptune and Uranus, and the same is true in reverse every which way.
This is really, I think, one grand trine in which one of the points is in two places. Uranus and Neptune are both within orb of trine with Mars and the moon, and your moon and Mars are exactly trine with each other, but Uranus and Neptune are out of orb for a conjunction with each other. However, they occupy the same sign and house, so their messages play out in the same area of your life with an Aquarian flavor.
Because your grand trine links the second, sixth, and tenth houses, its energies are likely to work for you in the arena of career (tenth house), day-to-day work (sixth), and money and acquiring resources (second). And because they're in air signs, you're likely to have a lot going for you in the way of ideas, communication, interactions with others, and other air sign implications.