There are two traditional rules to follow when it comes to planting bulbs.
Firstly, plant them at a depth equal to approximately twice their width. And secondly, plant with the pointy end up (except in the case of ranunculi and anemones, which are planted with the pointy end down).
You can either dig individual planting holes for each bulb using a narrow trowel or, if you’re creating a massed effect, dig one broad hole and lay them out before back-filling with soil.
For planting bulbs in a lawn area, a bulb planter is a useful tool: these remove a small core of earth, so you can pop in the bulb, replace the grass and wait till they emerge.