Most important things to take notice of:
- [Maximum] Forward current the current you can continously without pause feed to the diode without killing it - 100mA
- Peak forward current the amount of current the diode can handle when it's being lit with pulses, not a steady current, pay attention to the timing details! - 200mA for a square wave with a period of 100/0.5=200uS and pulse width of 100uS (50% duty cycle at 5000Hz)
- Forward voltage the voltage you should use when calulating the limiting resistor for current (depends on the amount of current that flows through the diode) 1.35-1.6V for normal operation
- [Maximum] Reverse voltage If you apply a reverse voltage greater than this to the diode, it very well might end it's working life (pay attention to the power supply and LED polarity) - 5V
- [Maximum] Power dissipation Current_through_diodeVoltage_over_diode=Power_dissipated and if you go over the rated power dissipation the diode will heat up and eventually melt so calculate accordingly (you can power the diode with square pulses, and do Power_dissipatedduty_cycle=Average_power_dissipated to $$Power\,dissipated = Current\,through\,diode \times Voltage\,over\,diode$$ If you go over the rated power dissipation the diode will heat up and eventually melt so calculate accordingly. You can power the diode with square pulses, and do $$Average\,power\,dissipated = Power\,dissipated \times duty\,cycle$$ to estimate the permissible currents for PWM operation).
The rest don't seem critical to regular use or are quite self-explanatory, but if anything's unclear, comment and ask more.
