Keep it simple
The purpose of text in a video is to transmit information which is considered essential for the viewer as part of the video experience. The most important aspect is that it can be easily read.
Classic fonts will work for the majority of contexts, they're clear to read and often have a variety of options for variation such as light, bold, condensed, etc. Consider simple animation such as fades, blurs, slides, etc.
Be Consistent
Ensure fonts, sizes, placement, colour, animation styles, etc are applied consistently across your video to portray a coherent aesthetic.
Don't rely on the default settings when you apply a font, you may have to make adjustments manually in order to ensure this.
Use of bold or abstract fonts or elaborate animation can be used, if used consistently and repeatedly throughout in order to create a visual theme and aesthetic.
Aesthetic / Tone
Consider your video's subject matter, mood, pace and audience.
Choose fonts, styles, animation which compliment and accentuate your concept and content.
If your video is calm, soft spoken with gentle music, then delicate fonts, neutral tones and smooth fades will probably work best.
If your video is bright colours, quick cuts and loud music, then bold fonts, bright colours and animation may be exactly what you need.
Things to Avoid
Text which is too small, too fast, too ornate, too dark or too pale, too textured or too animated can prevent vital information from being absorbed.
Too many fonts, colours, animation styles, etc in one video can appear aesthetically inconsistent and messy.
Titles - Introducing the piece, presentation or idea.
Keep the content as minimal as possible, the absolute essentials.
Have a clear Title. This can be achieved with a big or bold font, or allowing time for it to be absorbed on its own.
For presentations, your opening presentation slide may be used.
Descriptors - Provide context for a new speaker, location or subject.
Useful for Interviews, documentaries & overviews of larger projects.
Can be used to describe such as locations, groups, performances, etc
Needed when the speaker, location or subject is first seen, not needed for subsiquent appearances.
Sections - Divides the video into clear sections where content is divided as such.
Similar to Titles, section titles can provide a clear visual indication of a new scene, state, location, time of day, piece etc. Useful when the video is divided into sections, useful for presentations.
Make this very clear, either a large or bold font or time / visual space to absorb a smaller one.
Credits - Closes the video, can provide additional information, and credits all contributors to the video content and process.
Good professional practice to make sure all involved are noted, and spelled correctly.
This is where all necessary additional information should be included, speakers, performers, designers, technicians, supervisors, mentors, musicians, venues, funders, etc. Always be sure to include yourself, and mention the role you performed, videographer, editor, etc.
For videos such as Promos, Showreels, etc, your end credits might include dates, times, locations, websites, social media, etc, to send your audience to other resources of engagement.
Additional
Paragraphs / Quotes
Additional
Subtitles
Creativity
Text or other visuals can be created in external software such as photoshop and can be brought into your videos as image files.
Text can be placed creatively such as to fit into the shapes of objects in the shot, or to follow movements occurring in the frame.
The text required can be created in many other creative ways, such as during filming with physical objects, drawings or other forms or writing.
Font Placement
Some editors will provide guidelines to assist with font placement, this video shows some of these features in action in Final Cut Pro.
In the absence of guidelines in the software, there are a few key things to consider:
Try not to place your fonts too near the edge of the video, this can make fonts slightly harder to read.
Try to be consistent with your font placement, making sure elements are aligned cleanly, especially when using multiple text boxes on the same screen.