Agree with above - read POH.
Some hints:
1.) If it ain't got struts, then they must call that a:
Cantaloupe, (no, that's not it)
Canterbury, (nah)
Cantankerous (well it can be)
Catalina, (nope, that's where you fly to)
Cantilever. (ooh, maybe)
2.) When you take fuel out of a fuel tank, it must be replaced by air. How many ways did they design to vent the tanks. This is very important to know if you're doing your pre-flight while the fuel guy is filling the tanks.
3.) Speaking of fuel tanks, why do Cardinal owners rock the wings and take second fuel samples?
4.) My local DE told me that 2 out of 3 Commercial candidates can't identify where the hydro reservoir is located on Cessna retracts.
Some characteristics:
a.) Man are those big doors! You should see what happens when a prop blast or a tail wind hits them. Hint, hint.
b.) With those big doors comes the longest piece of weather seal you've ever seen. Biggest problem is the weather seal doesn't really seem to seal. You never have to worry about recalibrating for the alternate static source because all the outside air is on the inside (joke).
c.) Cessna tried to make the most cost efficient gear system it could on this airplane. Let's rephrase that - this is the cheapest gear system they could build. Anyone with extensive time in a Cardinal RG has either had a gear failure or is lying. Make sure the reservoir is full and the hand pump works before you leave the ground.
d.) The Cardinal B can easily be outclimbed by a C-172. The RG ain't much better. If you are familiar at all with a C-152, C-172 or C-172RG, then you can fly a Cardinal.
e.) At the back, there are the holes that the stabilator passes through. These holes are just about the perfect size for a starling, robin or cardinal (and I'm talking about the ones with feathers). If your C-177 owner hasn't devised some sort of foam inserts to block these holes, look for birds. The entire fuselage from the back of the baggage compartment to the tail is a wide open tube. I have personal knowledge of coming out in Spring to a little used C-177. On inspection, we filled 3-30gallon trash cans with bird's nest debris. (It looked more like a bird condominium than just a nest!)
This is one docile airplane - a good preflight, a healthy respect for the gear system and you'll have fun. Good flying.