Hello. I wanna sculpt something like that https://pl.pinterest.com/pin/305541155972397702/visual-search/?cropSource=6&h=309.89331698344574&w=530&x=16&y=10 but i dont know how to start. Could You give me some advice? thanks.
Hello @starrk92
If you are new to Zbrush, the first thing you need to do is learn how to use the program on a fundamental level. If you skip the basics, it will hamper you in everything else you try to do.
The following links can be useful for someone just starting out:
http://docs.pixologic.com/getting-started/
That is only to learn to how to use the tool. Sculpting requires artistic skill which the program will not supply you with. You will have to develop that as well.
If you’d like specific advice, on how to achieve a specific effect in Zbrush, please upload your images directly to the thread. You can just drag and drop them in the text window.
I’m not new. 
Just i dont have idea about this rocks
Ok. Firstly, searching for “sculpting rocks in Zbrush” turned up a wealth of free tutorials, so maybe avail yourself of these resources. This is a very well covered topic.
For a sculptorly approach, the following brushes may be useful:
- DamStandard
- Trim Dynamic
- Flatten
- Clay Tubes
- Layer
- Trim Adaptive
Try them, and see how the effects they produce might lend themselves to this task. This requires artistic skill, which no tutorial and nothing I can say here will give you if you havent developed it already.
- For a more procedural approach, some users might make use of Nanomesh for this task. Basically, attach a bunch of randomized nanos to a target surface that will generate rocky surface detail, then remesh it all together.
- Finally, the Clay Polish feature in Tool > Geometry > Clay Polish will help give a soft organic form some harder edges and may it look more rock-like.
@Spyndel i just think how to start the base shape. Make one rock then duplicate deform and position or on on the plane/cube make few