Tips for Hummingbird Feeders:

Nectar Recipe and Tips for Feeding Hummingbirds (Audubon) 

Essential Tips for Hummingbird Feeders (Wild Bird Unlimited)

Separating Hummingbird Feeders (Wild Bird Unlimited)

Hummingbird Safety (Perky Pet)

Providing a Water Source for Hummingbirds:

Attracting Hummingbirds With Water (The Spruce)

Create Your Own Water Source For Pollinators (Bee the Change)

Designing Your Garden:

Attracting Pollinators for Gardeners (Pollinator Partnership)

Design a Hummingbird Garden (Brooklyn Botanic Garden)

Gardening for Pollinators (US Forest Service)