Realize that lenses often outlast the camera body you start off with, so it is better to spend money on the glass up front - as ebiggs1 said.
When anyone asks me what they should get in terms of camera equipment I always ask them these questions to find out what will best suit your needs.
If you are choosing a lens system for an 80D you must realize the implications of the smaller sensor on what the lens "sees" as opposed to what is written on the lens itself. While a lens does not itself physically alter when put on a crop sensor body or full-frame one, how it behaves does. I suggest you read: https://www.dpreview.com/articles/2666934640/what-is-equivalence-and-why-should-i-care It will explain why you need to multiply the values written on your lens by 1.6 (the crop factor of your 80D) for the focal lengths and f values as your camera will apply them. How this works in essence is that an apparent wide angle lens of 18mm will, in fact, behave like a 29mm lens - much less wide angle than you might expect. At the other end of the scale a 200mm lens will actually have a Field of View of around 320mm, making things seem a lot closer.
You will get lots of very sincere advice,much of it differing but it will help everyone if you can tell us the following:
1. What is your budget?
That has a profound impact on what we can validly suggest for you. As Ebiggs1 said the body is a higher end unit, so it deserves decent glass, but if you run out of money for that you need to consider whether you should look at a sligtly lower end body, or a second-hand unit to save money for the glass. Remember lenses almost always outlast the camera bodies we buy, so your lens investment will be a longer term one.
2. What will you be photographing?
That will help to define the types of gear required. There is a wide range of uses for cameras and they often call for different gear. Thus someone doing weddings albums will likely have different requirements compared to a wildlife shooter or a videographer. For example:
If you are wanting general purpose photography I would suggest a combination of these:
EF-S 15-85mm USM lens, it has one of the widest angles (it will behave like a 24-135mm lens on your camera, and will be an excellent walk around lens.
If you want more telephoto options there are many and your choice will depend on exactly how much reach you want. Canon make a great EF 70-300 F4.0-5.6 IS II USM that is not a budget breaker and will have an equivalent FoV on your camera of 112-420mm. SO with two lenses you could cover a lot of situations. However if you hope to shoot birds at a long distance then Sigma 150-500 lens may be better. So you see it depends on your subject choices...
3. What kind of Output will you be generating?
VERY significantly, the requirements to produce high-quality large-format prints are very different from producing media for the web or for small prints, and then there is videography. If you go for just digital output you don't have to invest as much money as for say, large format prints.
4. How Serious Do You Intend to Get?
Will you be: e.g.casual, student, enthusiast, semi-pro, professional? If they are not serious do you need an expensive system? If you have very serious asperations then consider EF lenses such as the 17-40mm (28-64mm)* and the EF 70-200 (112-320) Mk II lens. By getting EF lenses you can put them on a full-frame body if you so choose in the future, while the EF-S lenses are designed only to be used on crop sensor bodies such as the 7D, 80D and Rebel bodies.
At the lower end of the scale the lenses I would suggest would be a choice of:
EF-S 18-55 (29-88) IS STM lens + EF-S 55-250 (88-400) IS STM These two lenses are cheap but perform well for their price point and could get you started.
or...
EF-S 18-135mm (29-216mm) IS STM lens + a suitable telephoto depending on your needs - maybe wait a while? Just getting the one lens could be a good way to get the feel of DSLR photography and decide later on how to invest in bigger glass.
*I have shown equivalence values in brackets
cheers, TREVOR
The mark of good photographer is less what they hold in their hand, it's more what they hold in their head;
"All the variety, all the charm, all the beauty of life is made up of light and shadow", Leo Tolstoy;
"Skill in photography is acquired by practice and not by purchase" Percy W. Harris
