1. Open the Assignments database (in the sidebar)
2. Hit + New
3. Fill in:
   • Name (e.g., "Bio lab report")
   • Subject (Math / English / etc.)
   • Type (Assignment / Exam / Reading / Project)
   • Due Date
   • Effort (Quick / Medium / Heavy)
4. Done. Move on.

Tip: Don't add everything at once. Add what's coming up this week. Add more as you go.