As discussed in Top 10 Etiquette Mistakes in Japan, there are two golden rules for apologising in Japanese:
1) If it’s your fault apologize.
2) If it’s not your fault, apologize.
I’m half joking but Japanese people tend to apologize more frequently than westerners. As they say in Japan:
とりあえず謝る – toriaezu ayamaru
(Whatever happens) just apologize
In this podcast, Asuka and Alex go through the basics of apologizing in Japanese in different situations and contexts. This is perhaps one of the most important skills you will learn when studying Japanese.