whew, where to start?
Ohms: unit of resistance. speakers are typically rated at 8 ohms (some are 4 ohms). really, this is nothing for you to worry about at this point.
Watts: unit of power. for speakers, it is the power they are capable of handling from an amplifier. typically you want the power handling for the speakers to exceed the power delivered by your amp (receiver).
higher wattage is going to imply a louder system, but there's many more factors involved. essentially any receiver is going to put out plenty of power for your speakers, you just have to make sure your speakers can handle it. comparing how speakers sound (with your ears) is much much more productive than comparing specs such as wattage, SNR, etc.
as far as car speakers go, they're cheaper because they don't come in an enclosure, so not only is there less material, there's less R&D that goes into making the speaker.
are you looking for speakers for a home theater? strictly music? your car?
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