To dry flowers you can place them in tray of silica gel & put in the microwave, or the simplest way is to hang flowers, grasses and seed-heads to naturally dry.
Nadia Lim's tips for drying flowers (plus 10 easy flowers to dry)
The Speediest and Easiest Ways to Dry Flowers - Walter Knoll Florist
How to dry flowers, Blog
Florist Series: How To Dry Flowers — Bloom Sheffield
Alaric Flower Design's Guide to Drying Flowers
5 Easy Steps To Drying Flowers In Books Step By Step with Video - DIY Craft Club
Dry Flowers Using Silica Gel - AGM Containers Controls
How to dry flowers - Gardens Illustrated
How to Preserve Flowers: 8 Easy Techniques
How to Dry Flowers and Greenery the Easy Way - The Home Intent
How to dry flowers - Gardens Illustrated
How to dry flowers Ways To Dry and Preserve Flowers Guide & Tips
5 Simple Steps to Style Dried Flowers