Innings
An innings is a side’s turn to bat. The number of innings depends on the format.
Over
An over is a sequence of six valid balls. Do not assume every physical delivery counts toward that number.
Wicket
The word can refer to the stumps and bails or a dismissal. Listen to the context.
Extras
Extras contribute to the team total rather than the batter’s credited runs. Use the scorecard’s breakdown to see where they came from.
Learn in context
Build a short glossary from the commentary you hear. Check detailed definitions and exceptions against the official Laws.
Official reference
https://lawsofcricket.lords.org/home