Explanation
According to the SAFe Agilist 6.0 domain of PI Planning, the confidence vote is a process where:
Each team conducts a vote using their fingers (fist of five) or a digital tool for remote events The teams vote on the confidence level for the objectives as a set, and if confidence is high enough, the aggregate set of objectives becomes the committed ART plan The Release Train Engineer summarizes the team objectives into the ART PI objectives in a format suitable for management communication
https://scaledagileframework.com/pi-planning/

Explanation
According to the SAFe Agilist 6.0 domain of Built-in Quality, this practice reduces bottlenecks and ensures consistency by:
Encouraging teams to share responsibility for the quality of their work products Establishing common standards and guidelines for coding, testing, documentation, etc.
Enabling teams to collaborate and coordinate across domains and dependencies Promoting a culture of continuous improvement and learning
https://scaledagileframework.com/built-In-quality/

Explanation
Lean Portfolio Management, Agile Product Delivery, and Lean-Agile Leadership are SAFe core competencies.
A SAFe core competency is a set of knowledge, skills, and behaviors that enable an organization to achieve business agility. Business agility is the ability to compete and thrive in the digital age by quickly responding to market changes and emerging opportunities with innovative solutions. There are seven core competencies in SAFe: Team and Technical Agility, Agile Product Delivery, Enterprise Solution Delivery, Lean Portfolio Management, Organizational Agility, Continuous Learning Culture, and Lean-Agile Leadership. References:
SAFe as an Operating System for Business Agility, Core Competencies of Business Agility

Explanation
Features are found on an ART planning board. An ART planning board is a tool that helps teams visualize and manage the work items for an Agile Release Train (ART). An ART is a long-lived team of Agile teams that delivers value in a regular cadence. Features are high-level descriptions of system behaviors that provide business value to a stakeholder. Features are derived from epics and decomposed into user stories or enablers.
Features are prioritized by business value using Weighted Shortest Job First (WSJF) and planned for Program Increments (PIs) by the ART teams. References: Organizing Around Value with ARTs, ART Planning Board