1. Geography/Navigation Knowledge

Tools for navigation include maps and compasses.
Apps like "All Trails" provide directions to the trailhead and maps of the trail, which can be downloaded.
You shouldn't always rely on your phone. Phones can lose battery, get dropped, etc. Print out a maps of the trail or find a paper map.
Trails like Sespe River Trail have a clear path are a fairly straightforward, but not all trails are like this. Learning how to read a map and use a compass are important skills when hiking in the backcountry.

2. Building a Campfire

If you're camping at an established campsite, there will usually be firepits (a place to build your fire) already set up.
Read about Leave No Trace - Principle 7: Minimize Fire Impacts -- This will help you learn how to build a fire safely.

When backpacking, you'll be far from hospitals. Make sure you know how to treat a burn, cut, scrape, blister, or broken bone, sun burns, ticks, poison ivy, etc.!
The First Aid/Emergency lists I provide on this site is very basic. If you plan on backpacking in wet weather or precarious landscapes, I suggest having a more advanced first aid kit.

It's important to familiarize yourself with the local plants and animals in order to recognize danger.
Common species to look out for in Santa Barbara are poisonous plants and ticks.

This goes for all the equipment you use, but make sure you know how to operate your stove and to use the fuel before you go on your trip.
Dishwashing probably isn't something you considered when thinking about camping... but yes, you will need to wash your dishes and there is a right way to do it -- or you can just lick them clean! (Do what ya gotta do).

Spending long periods of time with people can be hard, even if they are your family or friends.
Communication is key. Set boundaries and delegate tasks. Also, don't forget to have fun! Play games while on the road, make music playlists, etc.
Also, make sure to bring plenty of snacks and water. Food is always a good way to boost morale on a hard hike!

"Leaves of three leave them be" is a phrase that will help you remember what to look out for.

Source: Healthline.com