what does QopCraft mean?

Qop means Quality of Performance

this modpack has all the performance mods installed for the best experience for the users

• and not to forget that it has QoL mods installed that make life easy to play Multiplayer or that the Bugs are Fixed and make users enjoy Minecraft even more

What this Modpack has

• all the performance mods 
• Entity Model/texture feature
• many QoL mods
• Shader Support (Oculus)
• Fast Chunk generation
• Multiplayer
• World Map/Mini Map
• Server optimization mods
• built in Texturepack and Shaderpack Installer
• Bug fix mods

i also didnt change the menu like other modpacks its only the name from the modpack on the menu bottom left not more!

How do i play with Friends?

you go to your World and press ESC and press Open to Lan

if you play with Friends Offline you need to activate Offline+UUID Fix_

and if you want you can activate PVP or not it is your choice

and if so than you can press Start Lan World

if there is an popup in the chat that says Starting up Cloudflared Tunnel...

you have done everything right, in the chat it says how to go to the world in Multiplayer

i think you can play on other Servers bc those mods are both Clientside and Serverside