Audio and wifi problems

I have an i5 3470
Asus H61m - CS
12 gb 1600 mhz ram
240 Kingston SSD
GT 710
Tenda wifi adaptor

Actually I'm a 14 yr old school boy
Please help me

I have successfully installed mac os Big Sur but I am having problems about the mic and the sound along with wifi problems

And I have heard that opencore is better but it's much difficult so please can you help me with that

Thanks for giving attention