How to make good defences for online bases.

First to make some traps you will need redstone, string ( if using tripwire hooks) pressure plates (trap has to be close to the pressure plates if chosen) and a couple of dispencers. First make a simple base with a couple of concealed empty spaces in walls (you will need this for hidden redstone trap aswell as a passage to get to it ) Then once finished comes the redstone. You will need to make sure these spaces are a 1 by 1 leading to another tunnel for the redstone or else might be accessible. Depending on how long concealed spaces are you will need 1 space less on each side, that way you can put the tripwire hooks in at the end.

Then, you attach the string together to make the tripwire system. After this, you will need to do the redstone leading to where you are going to put the dispencers ( might need redstone blocks depending on how long tunnel because of the signal getting weaker further away). You put the redstone leading to the back of the dispencers to connect the signal. Finally, you put arrows into the dispencer so that you can give the raider a surprise. Make sure also to line the 2 spots perfectly unless it will not work.