There are three main ways you can leave a gift:

Residuary  leave a share in, or all of, what is left of the value of your estate after you have provided for family and friends. The advantage of leaving a share is that it stays the same over time and you won’t need to change your will to keep up with inflation.

Pecuniary  a set sum of money. You can index link your gift if you wish, to stop it losing value over time.

Specific  This is an item you wish to leave and could be anything from jewellery, a piece of art, to a house.