Iam a beginner and i have a task but idont have ideas to create
First off, welcome to the forums.
Second, is your task to ‘do a thing’? There’s a lot you can do, but usually it starts with a specific want or need.
thank you,
my task is to make something that help you in revit but to be a new idea or creative ( it will be ok if the idea help me as a civil engineer) and i have no idea what to make as being a beginner
Welp, I’m not a Civil Engineer so I can’t really speak from personal experience here, but you can use the search tool on the forums to see what’s currently being done with Civil3D to either eliminate those ideas as options or to see if there are variations you can explore.
For something this open-ended, you more or less want to choose one of a few categories:
- Data Management (take information from one source, process it, and move it to where it needs to be used)
- Geometry Exploration (I assume tunnels/culverts/aqueducts etc. would be something worth looking at?)
- Functionality Improvements - What does Civil3D not do that you would expect it to? What does it do that isn’t in conformance with industry standards or local codes? Is there a niche design case or client type that would benefit from very specialized procedures? Can you take what’s available and bridge the gap?
Thank you for your help 
Start simple. Find a task you generally have to do manually and focus on that one step at a time.
If you havent been through dynamo primer, do that first:
More creative ideas tend to be more complex, so dont see a small/simple/boring task as not worthwhile (i know business’ always want to see the new shiny thing, but in reality a lot of automation isn’t that sexy on paper).
I would suggest creating stations from excel data might be a good first civil task. You will probably also want to install civil3d toolkit and/or camber as they expand the capability of dynamo for c3d significantly.
Focus on looking at lists, how data flows and the fundamentals of putting a script together first. Use watch nodes to inspect data as well. You’ll progressively learn techniques that can eventually go towards more complex workflows.
Ideally dont begin with complex geometry - points and lines at the most. Focus on data and list management before exploring more complex geometry like surfaces, solids, meshes etc.
Your task should be to head over to the Aussie Bim Guru channel on youtube and look for videos that peak your interest.
From there your brain will start to form ideas. I recommend starting with 1 Dynamo graph that is easy. Such as setting all Viewport Labels to a fixed position relative to the Viewport.
If you’re stuck for inspiration, don’t focus on what you don’t know. Work through all the other things you want to accomplish outside of Dynamo.
- Start up that project that you shelved because you kept running into issues.
- Work on that thing you’ve always wanted to try.
- Build that intelligent family or block that seems to complicated to work consistently.
- Go back to all your least favorite tasks or biggest annoyances and see where you get fed up.
Then ask yourself what you would need to make all these things easier, faster, or even possible. That’s where you can get inspiration to expand the things you’re familiar with but still require additional leverage. That gives you research topics for Dynamo. How can Dynamo address those issues? What packages are built for those sorts of processes? Get inspired by what motivates you and then determine how Dynamo can support those ideas.
Welcome to the forums 
As Gavin already said, go through the primer. It’s really, really good.
After that maybe try something really simple like, get some parameters from Revit and change them based on a simple rule.
Or get some items from Revit and learn to filter them.
Get- Set and filter by bool mask are really useful for so many things (I’m not a Civil Engineer but I’m guessing they’ll be just as useful for you)
Have fun playing!