Understanding the constructive and destructive part of it (mochaik).
Does It Make a Difference How One Removes Something Growing from the Body (e.g., Cutting vs. Biting Nails, Cutting vs. Plucking Hair)?;
Halachic Implications of Changes in Items When Gathering. Unusual Methods of Gathering or Collecting for Disposal;
opening salt containers, net bags, plastic bags in boxes;