Adding mods to my server.

HELLO

I have a Aternos server and I play with my friends, but now we are bored by playing survival mode for so long. So i decided to add some mods to my server for more fun, but i am unable to add any of them. My friend wanted to play the various mods which are played by many you-tubers like George, Sapnap, Dream etc. Can anyone help me that how can i add the mods. me and my friends we play on TLauncher.

Thanks

Like i just don't know how to do all this modding servers, still i am learning.

Is there any tutorial which explains all the basics of modding etc. ?

Thanks