The editing of media is very important. You can have amazing footage, that turns bad with the wrong editor, and you can have bad footage, that an editor can make look fantastic. Here's some tips for editors to hopefully help start them on the important task of putting together videos!
1) Backups, Space & Saving
Make sure the original raw footage is backed up in two separate places. Just in case something happens, you will still have the footage.
Make sure before you start that you have enough space to edit and complete the project. Transferring these types of files can take a very long time. Ensuring you have enough space means you won't have to deal with finding hard drives in the middle of an edit.
Most important, SAVE! Save all the time, computers can crash, power can go out, the list goes on. This will ensure your time and efforts are wasted if something happens.
Create a storyboard, and label all of your clips. This becomes very important the longer the final product is.
This will ensure you've looked at all the footage, and make the overall editing process easier.
3) Create a Rough Edit
Put the main footage in your timeline in the order you will be telling the story. Then start cutting out the beginning and end footage you know you won't be using (slates, action etc.)