Dear users, I am excited to start my LAMMPS journey in order to have command of it, and later I’ll use it in my PhD work. My first task is to find the lattice constant. I’m new to this software, so please let me know how to start and what steps I should follow.
Thank You.
Hi Ahsan,
This forum is really for LAMMPS related questions. What that means is that you will likely not get answers to your scientific inquiries, even if you would like to use LAMMPS to answer them. After all, that will be your (exciting!) work to do. 
“I need to find the lattice constant” is not a very specific question either. The lattice constant of what? Do you mean that you expect there to be a functionality in LAMMPS that gives you the lattice constant of a metal/crystal? If you want to know what it is under normal conditions you can just Google that. If you want to create a structure with a specific lattice constant, then I recommend using Atomic Simulation Environment (ase) to generate your structure and then convert it to a LAMMPS file. Bravais lattices — ASE documentation
If that’s not your question, I advise you to rephrase it.
Thank you, dear. I’ll rephrase it and ask the question again.