Prerequisite

Best practices for apple ecosystem

Xcode Configs

Don't commit unnecessary files to version control
Avoid committing Team, config of Xcode signing, provisioning to protected branches.
Use .gitIgnore appropriate config files for apple/iOS projects.

Things to look out for

Always kind of make sure that if you can switch from class to structs - more optimized
Use enums rather than other extra variables or configs in swift
use let instead of var immutability vs mutability
Always check whether the classes defined are finalized as it is more optimized
Use string concatenation instead of String interpolation