Construction.
> Z and Shift+Z change the symmetry.
> X changes the angle snapping.
> Alt + click on part on a craft clones that part and anything connected to it.
> Shift + click lets you reposition the craft as if you'd grabbed the command pod.
> WASDQE lets you rotate parts.
> Shift + WASDQE lets you rotate parts in smaller increments.
> Action groups are useful. Custom 1-0 are bound to the number keys. Abort is bound to backspace.
> The Clamp-O-Tron Jr. can only dock with other Clamp-O-Tron Jr. docking ports. All other docking ports can dock with each other.
> The HubMax Multi-Point Connector does not have docking ports on it. These must be added separately.
> The arrow on decouplers points to the part that will be detatched. The decoupler will remain on the side the arrow is facing away from.
> The arrows on fuel lines show which direction the fuel will be pumped.Flight.
> Capslock toggles fine movements.
> Alt + WASDQE adjusts trim (changes the "centre point" of the controls so you can fly your plane ascending without having to hold S).
> Alt + X resets the trim
> X sets your throttle to zero.
> Alt + ., uses physical time warp (craft aren't put on rails, can be used in atmosphere).
> C changes camera modes. Some internal views have a radar altimeter that shows you height above ground instead of sea level that the main altimeter uses (useful for landing).
> Hold the right mouse button and drag to move the camera off-centre.
> Double middle click to return the camera's centre to the craft's centre of mass.
> V changes which kerbal you are piloting from.
> L toggles all lights.
> G toggles all landing gear and landing legs.
> ] and [ switch to any nearby craft.
> F1 to take a screenshot. Goes to KSP\Screenshots
> F2 to toggle GUI elements (altimeter, navball, staging etc.)
> F3 to toggle the flight results window.
> F4 to hide craft markers (diamonds with names underneath).

> When craft are docked, right-click on a tank of fuel/monopropellant/a battery and then Alt+right-click on another container of the same type to bring up the resource transfer menu.
> Shielded docking ports must be opened by right-clicking on them before they are able to dock.Spaceplanes:
> Make sure your centre of mass is in front of your centre of lift, otherwise your plane will flip out. Front fuel tanks drain first, shifting the centre of mass backwards, so make sure it is still in front of the centre of lift in this case.
> To get an SSTO to orbit, ascend rapidly to 10km, then level out. At this point your speed should shoot upwards. Ascend slowly to 20km, using RCS to keep your nose pointed forward. When your intake air is approaching zero, ignite the rocket engines. This will increase your speed enough to get more intake air. Once this intake air is about to run out, disable the atmospheric engines and the close the air intakes (use an action group for this). You should be at around 1,600 m/s by now. Use the rocket to point you straight up and out of the atmosphere, then circularise.

EVA
> Hold shift to run while on ground in gravity.
> R turns on RCS.
> L turns on lights.
> Holding the left mouse button and dragging lets you rotate your kerbal (useful for aligning with ladders).
> Holding shift with WASD on a ladder lets you lean in that direction. Pressing space while doing this lets you jump off the ladder in that direction.
> To delete all debris, go to settings and set persistent debris to 0, then start a flight, then reset the debris to what you had it to before.
> Alt + F2 to open the debug console. It tells you what parts have crashed your game. You can sometimes see what's causing slowdown too.