How do I know what grade bolt to use?

Good day, could you please clarify for me how one goes about determining the appropriate grade of bolt for a given application? I understand that different grades of bolts offer varying levels of strength and durability, but I'm unsure of the factors that should be considered when selecting the right one. Are there any specific guidelines or standards that should be followed? Additionally, how do I ensure that the bolt I select is compatible with the materials it will be used with? I'd appreciate any insights you can provide on this matter.