What changes in real operation
Courtesy is technical efficiency: clear call signs, short transmissions, accurate reports, and controlled audio let more stations communicate with less interference.
The shortcut that causes trouble
A legal transmission can still be poor practice if it splatters, monopolizes a frequency, ignores a net, or conceals who is transmitting.
Put it into practice
Know the rules and local band plan, monitor before transmitting, check signal quality, identify as required, resolve conflict calmly, and correct equipment problems instead of arguing through them.
Use current equipment instructions, battery and controller limits, measurement references, operating rules, and observed propagation. Planning values and propagation labels are not guarantees.