Pentagram and pentacle
A pentagram is the five-pointed star itself, long used in Western magic and in Christian symbolism before that. A pentacle, in Wiccan usage, is usually a physical disc bearing the star, kept on the altar and used to represent earth or to consecrate objects. The five points are commonly read as the four elements plus spirit, a modern reading.
Athame, and the boline
The athame is a ritual knife, usually black-handled, used to direct rather than to cut: casting a circle, saluting the quarters, the symbolic Great Rite. Its form comes from grimoire and ceremonial magic tradition. The boline, a white-handled working knife for cutting herbs and cords, appears in the same lineage. Blade law varies by country and by age, so check before carrying anything anywhere.
Wand, chalice, cauldron
The wand directs, much like the athame, and in several traditions is associated with air or fire depending on who wrote the book. The chalice holds drink for cakes and ale and stands for water. The cauldron is a container for burning, brewing, holding water for scrying, or simply for looking impressive at Samhain.
Besom, bell, cords, censer
The besom, a broom, is used to sweep a space symbolically clear rather than to clean it, and the flying-broom imagery is trial-record folklore rather than practice. A bell marks beginnings and endings and is a cheap and effective cleansing sound. Cords are used for knot work, and in initiatory traditions to mark degrees. A censer or heatproof dish holds burning incense or charcoal.
Candles and incense
Both are atmosphere and focus, and both are optional. Fire safety applies every time: heatproof holder, clear surface, never unattended, never asleep. LED candles are a legitimate substitute in rented rooms and around pets and children. Incense smoke bothers asthma, small pets and especially birds, whose lungs are extremely sensitive: ventilate, or skip it.
The Book of Shadows
In initiatory Wicca the Book of Shadows is a coven text copied by hand from initiator to initiate, and parts of it are oathbound. In general use it means your own working notebook. The name and the practice are twentieth-century, and yours can be a cheap notebook or the one in this app.
The scourge, as history
Gardner's material includes a scourge, used lightly and symbolically in certain initiatory rites. It appears in old tool lists for that reason. It is included here as context; it is not a beginner tool and this app does not teach its use.
What do I actually need?
Very little. Your practice can be built from the things already around you, and grow later if you want it to. A mug can be a chalice. A favourite stone can sit on your altar. A stick found on a walk can become a wand. A pentacle can simply be drawn. Some people love traditional ritual tools. Some gradually collect objects that feel meaningful to them. Others keep things very simple. All of those are perfectly valid ways to practise.
Start with what you have
If there's a particular tool you're drawn to, you can learn about it and decide whether you actually want one. There's no rush to build a complete collection. Often the things that become most meaningful are the ones you choose slowly, find unexpectedly, make yourself or simply use often enough that they become part of your practice.