Difference between two sentences

[Happy_elf63]

Wich one is correct?
I will come home after I will finish shopping or I will come home after I finish shopping

 

[PaulMatthews]

[1] *I will come home after I will finish shopping.

[2] I will come home after I finish shopping.


[2] is correct.

The complements of temporal prepositions such as "after", "before" etc. take simple present, not the will construction, when the reference is to future time, as it is in your example.

 

[GoesStation]

[1] *I will come home after I will finish shopping.

Note that the asterisk means "what follows is incorrect."