Recommended events (for details see the table bellow) are useful because they could be used in the segmentation.

The segmentation could be performed on recommended properties only.
All recommended properties are optional.

Additionally, custom properties of your choice could be specified. However, they cannot be used in the segmentation.

Event Name	Group	Recommended Properties
viewed page	Web tracking	title, url, utm_campaign, utm_medium, utm_source
viewed product	Web tracking	url, productTitle, productId
viewed category	Web tracking	categoryId, pageTitle, utm_source, utm_medium, url, utm_campaign, categoryTitle
added product to cart	Cart events	sku, variant_id, product_title, product_id, quantity, url, categories
removed product from cart	Cart events	quantity, product_id, categories, url, sku, variant_id, product_title
placed order	Orders	order_number, product_tags, order_name, products, product_count, customer, shipping_rates, order_note, billing_address, shipping_address, discount_codes, order_status_page, product_categories, order_currency, order_tags, order_id, product_skus, shop_currency, source, product_vendors
cancelled order	Orders	order_tags, billing_address, shipping_rates, product_count, products, order_id, shipping_address, product_tags, shop_currency, order_status_page, order_currency, order_note, order_number, discount_codes, product_categories, customer, source, cancel_reason, order_name, product_vendors, product_skus
updated order	Orders	billing_address, source, products, product_vendors, shipping_rates, shipping_address, product_tags, product_categories, discount_codes, order_name, order_tags, order_currency, order_id, refunds, order_status_page, customer, product_count, order_note, shop_currency, product_skus, order_number
paid for order	Orders	refunds, source, order_number, shipping_rates, order_note, product_vendors, product_categories, order_id, product_tags, shipping_address, product_skus, products, billing_address, order_currency, order_name, discount_codes, customer, shop_currency, product_count, order_status_page, order_tags
order shipped	Orders	order_note, order_currency, customer, discount_codes, shipping_address, shop_currency, source, product_vendors, billing_address, product_tags, product_categories, refunds, order_tags, order_name, order_id, shipping_rates, product_skus, product_count, products, order_status_page, order_number
shipped order	Orders	order_currency, order_note, products, discount_codes, shipping_address, order_id, customer, refunds, order_tags, product_tags, product_vendors, shop_currency, source, order_name, order_status_page, shipping_rates, product_count, product_categories, product_skus, order_number, billing_address
received order	Orders	billing_address, customer, shipping_address, product_vendors, order_note, shipping_rates, product_categories, product_count, order_id, order_tags, refunds, order_number, shop_currency, order_name, product_tags, order_currency, order_status_page, products, discount_codes, product_skus, source
refunded order	Orders	shop_currency, order_tags, discount_codes, product_tags, product_skus, product_count, order_name, product_categories, source, order_currency, order_number, refunds, order_id, shipping_address, order_note, shipping_rates, products, order_status_page, customer, billing_address, product_vendors
received a promotion	Marketing	type, channel, message_id, message_title, name, promotion_id
opened a promotion	Marketing	channel, promotion_id, device, type, language, message_title, message_id, os, name, browser_name
clicked on a promotion	Marketing	message_id, browser_name, promotion_id, message_title, url, type, device, os, channel, language, name
viewed cart	Cart events
applied a coupon	Discounts
added wishlist product to cart	Whishlist
reviewed a store	Reviews
bought product	Products
received a coupon	Discounts
contact identified	Contacts
had coupon denied	Discounts
removed product from whishlist	Whishlist
searched products	Product lists
added product to whishlist	Whishlist
removed coupon	Discounts
started checkout	Cart events
reviewed a product	Reviews
reviewed an order	Reviews
returned product	Products
filtered product list	Product lists
viewed product list	Product lists
viewed form	Forms
entered a coupon	Discounts
filled in a form	Forms