The reading list
Link-out only. Agencies and primary rules, not people selling you the gear.
Permits, and the guide requirement
Rules changed. Check the authorities rather than a blog post written before they did.
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Department of National Parks and Wildlife Conservation
The authority for Sagarmatha and the other national parks. Entry permits are issued under this department, not by your trekking company, whatever the package implies.
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Nepal Tourism Board
The state tourism body, which administers trekker registration and publishes current rules including the guide requirement. Promotional in tone, and still the official source.
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Department of Immigration
Visas, extensions and the on-arrival process. Go here rather than to an agency that charges to fill in a form you can complete yourself.
Altitude, which is the actual risk
More trekkers are hurt by ascending too fast than by anything else on the mountain.
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Himalayan Rescue Association
Runs the aid posts at Pheriche and Manang and treats altitude sickness every season. Their guidance on ascent rates and symptoms is the best available anywhere, written by people who have no trek to sell and who see the consequences.
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Nepal health notices
Vaccines, water and food precautions, and altitude guidance from a public health agency.
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Nepal travel advice
Entry rules, regional restrictions, road safety and current conditions. Blunt about domestic aviation, which has a poor record.