Resistor Power Handling Capacity
All resistors have a power handling capacity.
This means you have to calculate the power of the circuit you are designing, so that you use resistors appropriate to the task.
(All our kits have the appropriate resistors included, so you don't need to worry.)
A resistor that is over-powered will get very hot, probably start to smoke and fairly soon burn out or catch fire. To be avoided.
It's never a problem to use a resistor with a higher power rating than you need.
You will, of course, need to look at the top halves of those same pages in order to work out the resistance needed for your circuit too...