Which resistor for my LEDs parallel
The Vf and If would be the same for each led. Leds in parallel will share the same voltage while the current adds up.
25 Ohms * 0.08 Amps = 2 V


This. Each led uses 20 mA, so you need to calculate using the combined current.

They give you the recommended resistance to use too.


The voltage drop across the resistor will apply to the entire series circuit. Each led in series with the resistor will only see their part of the voltage, which in this case would be 5V source - 2V resistor voltage = 3V led voltage.