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[FAQ] I want to use Hall Effect Sensors - where do I start?

Other Parts Discussed in Thread: DRV5015, DRV5012, DRV5013, DRV5011, DRV5013-Q1, DRV5015-Q1, DRV5023, DRV5032, DRV5033, DRV5023-Q1, DRV5033-Q1, DRV5021-Q1, DRV5056, DRV5057, DRV5055, DRV5053, DRV5055-Q1, DRV5056-Q1, DRV5053-Q1, DRV5055-ANGLE-EVM, DRV5055EVM, DRV5055-5057EVM, DRV5011-5012EVM

I need contactless position measurement, angle measurements, switching and latching digital outputs with magnets.  How do I choose a part?  How do I choose a magnet?  Help me get started!