This is the 479th most frequent Russian word.
команды
"Команды" means "commands" or "teams" in English, depending on the context.
In this sentence, 'команды' is the genitive singular case of 'команда', meaning 'team', indicating possession of the 'leader'.
Руководитель команды принял важное решение.
The team leader made an important decision.
In this case, 'команды' is the genitive singular of 'команда', meaning 'command' or 'order', as an instruction given by the captain.
После команды капитана, игроки начали играть.
After the captain's command, the players started playing.
Here, 'команды' is the nominative plural form of 'команда', indicating multiple teams as the subject of the sentence.