How to get glmr for gas?

Hello there, I'm curious about the process of acquiring GLMR tokens for use as gas fees on the network. Could you please elaborate on the various methods one can use to obtain these tokens? Are there any specific exchanges or platforms that facilitate the trading of GLMR? Also, are there any specific requirements or procedures that need to be followed in order to successfully use these tokens for gas? I'm looking for a clear and concise explanation to help me understand the process better. Thank you in advance.