can someone pls explain all the differences to me, im a new ...

can someone pls explain all the differences to me, im a new tradeer

for e.g im basically trying to buy nvida now when it hits 105 or lower even better, but not pay more that for it. and i strictly want to buyindividial shares, i do not want to end up buying fractional shares. what options should i make..?

i understand market order = simply means buying at whatever price it is when the system executes the order immediarelt by the system you dont get to say or choose . im most confused by the diffeeences between limit order vsm arket if order , limit if order, stop limit if order...

and what are the "trailing"  options?

also does moomoo convert ur currency and hold ur money indefinitely until ur order has went through once u made a trading order

have tried to read online but still dont understand, someone help pls