Sprint planning is a meeting that team holds together answering one question: What are we planning to accomplish in the next sprint?
At the beginning of each sprint planning meeting is carried out where the team decides how many tasks it can take into the next sprint. The entire team should be involved in planning.
When planning a sprint take into account few key points:
If you have at least 1 sprint worth of prioritized and groomed product backlog, sprint planning meeting shouldn't take more than 30 minutes.
While it's ok to occasionally groom 1 or 2 tickets during sprint planning meeting, it is not recommended to combine sprint planning with backlog grooming activities.