Scrum Team

Hi All

I have 2 questions about scrum team, pls share me your knowledge

1. Self-organizing means that teams can choose how best to accomplish their work

Question: Are there any framework/template so that team can base on them to choose the best way to accomplish ?
The reason I ask this is: If the teams are allowed to be free to choose the way to accomplish, there will be some risk:
- They can lack of some steps/activities which have been proved to be necessary by previous projects
- They can not inherit the lesson/practice from previous projects

2. Cross- functional that mean teams have all competencies needed to accomplish the work without depending on others not part of the team
Question: Is cross-functional
- on the team (mean: including >1 person; these person have all competencies)
- or on the member ? (mean: one member have all competencies)

Many thanks