If you want to use "hacks" with friends, renting a server from providers like LOW.MS or Host Havoc allows you to enable sv_cheats safely for everyone. Avoid any "free hack" that asks you to:

Many servers use custom anti-cheats like Garrett's AntiCheat that can detect common ESP and Aimbot patterns, resulting in an instant IP ban from that community. Safer Alternatives

If you want to experiment with these features without risking your account or PC, use legitimate methods within the game: How to Use Safely

Most Garry's Mod servers are VAC-secured by default . Using detected external cheats will lead to a permanent ban on your Steam account.

or add an exclusion for an .exe file. Complete "offers" or surveys to get a download password.

Search the for "Simple Aimbot" or "ESP" addons. These run within the game’s safe environment and are legal for use in single-player or on your own server. Built-in Cheats