How to keep my Honda in good shape?

Yesterday I bought a 1998 Honda Accord LX automatic for $1500 and it has 183,000 miles on it. It runs amazingly, but it needs new brake rotors which are getting replaced this weekend. I'm just worried the transmission will slip like what has happened to others. The car has a new starter, new spark plugs and spark plug wires and a new battery. I love this car and I want to keep it running good, are there any tips on how to make this car survive over 300k miles? If it helps it's a 4 cylinder vtech. How to keep my Honda in good shape - 1

Might last 300K many people don't keep their car that long. Because cosmetically (paint) wears out. Plus more expensive things start to break on the car. Thus people get rid of their car. You paid 1500 for the car if it last 2 years you got your moneys worth out of it. The best you can do for the car now is maintenance. Check the condition of the fluids replace them if they dirty. Check the condition of the timing belt e, engine belt and radiator hoses. Also other small coolant hoses. If any of them feel soft or look cracked and old replace them As soon as possible.

Automatic transmissions have internal clutch packs that help transfer power and just like a manual transmission these friction surfaces eventually wear out, so at 180K miles you might start a slush fund to pay for a slush box rebuild. Honda automatics are good products when maintained so will have to look at the prior services. And as Jimmy mentions there are the scheduled maintenance items like timing belt/water pump, struts, and you always need to keep an eye on the CV joints for leaking/cracked boots. Check the steering rack now and then for leaks also. The Vtech valves need to be adjusted on a regular milage schedule too, so is always a good time to give the engine a good looking over.

Get a mechanic to check it out for you, like should have been done before you bought it. It might be an OK car for $1500-$2000. The 1998 Honda transmission wasn't plagued with the same problems the later ones had.

Leave the transmission alone. Wait until it goes on its own. Specially at that mileage.
go to the dealer and buy an extra atf bottle, IF you need to top off the transmission fluid use Honda only. You can use Dextron if you have an emergency, but as soon as you get home or repair shop it has to be drained off, this = everything inside the transm. So buying an extra bottle for that purpose is by far cheaper than replacing the whole thing.