Always start by greasing/oiling your new belongings before you use them (but make sure you try them first). Keep all leather dry and cool. Clean regularly with leather soap.
Grease/oil all leather to maintain its suppleness and to increase durability. Let it dry for several hours, then rub off any excess.
Grease in moderation "adequate is best". Re-oiling needs to be done to increase the life of the leather.
Conditioner – Contains different oils and waxes. Makes leather soft and gives a slightly water repellent surface. Re-oiling is done after cleaning with soap.
Oil – Protects against water, damp, mould and salt/salt water (sweat). Keeps the leather soft and supple and makes it "resistant to tearing". Contains mineral oils, animal and vegetable fats. Good on leather that has become dry. You should not use too much along the seams as it can easily become airtight and the seams can "rot" and give. This generally applies to all leather oil.
Glycerine soap – Glycerine is also a preservative and softener for leather, and is especially good for light leather. It has a greater polishing effect and is therefore preferable if you want your leather to shine.
Lanolin soap – Lanolin is a preservative and softens leather. Use with very little water.