The intl. key position is what matters - not its contents.
Here are some basics:
Blue ->arrows mean control / steering - rudders, ailerons.
Blue characters concern navigation and pilot information.
Red dots deal with radar and friend/foe identifiaction/selection.
Yellow dots deal with take-off and landing.
Green dots have to do with weapon systems and countermeasures.
Cyan dots have to do with weapon selection.
Spacebar is brakes.
 
Kp means Keypad / Mouse / Joystick whatever selected in Preferences…
Red arrow is roll, blue arrow is pitch and green arrow yaw of the Hornet.
Roll by sidesticking; pitch by push-n- pulling the stick; yaw by , . – keys).
 
Note the -o- velocity vector and the –w– waterline in relation to the flight direction and nose position. The angle between the two is the angle-of-attack and is shown in the AOA Indexer which is (to my opinion) discussed in a confused way on page 36 of the F/A-18 Hornet 3.0 "Operations:…" manual.
v means too slow, increase throttle (+), decreasing the AOA.
√∏ means you are 'on speed', keep 'm going - AOA fine,
^ means your too fast, decrease throttle (–), increasing the AOA.
A general good landing speed is about 150-160 knots, a safe circuit and approach speed about 200-220 knots. Taxiing below 20 knots.
Check your manual particularly for understanding the various radar modes.
For general purpose use TWR radar for flying targets and GMT for ground moving targets. Select them with the R and Q keys. Tab for distance.
Use your Radar Warning Receiver Azimuth Display to see where signals are coming from. You now have a very sophisticated RWR with co-indication in the Head Up Display (HUD): watch I (nterceptor) and S (ams).
Plan your missions prior to taking off, check your map, your navigation (M, N) and choose the correct Tacan beacons, or pre-set Waypoints. Check where you are and go !
Select the Autopilot and its correct function (Shift+A) to navigate efficiently.
Don't forget to call in a wingman (F1) for help and engagement (F2) on time...
And keep safe distances to your adversaries and recovery heights from the ground!