Do you like to shop online shopping or in person? Give reasons

Generally, I don't usually shop online and neitheor in person, because I don't have enough money to wast ite on buying clothes that I do not need.

Or you could say, “Generally, I don’t shop …”
Or you could say, “Generally, I NEITHER shop online NOR in person, …”

The best thing ofabout this option is that you can try everydifferent sizes of the clotheing items in the shop.s.

If you shop online and you choose accidentally achoose the wrong size, you have to do a boringreturn the item. The proccess for the return andis inconvenient and you need to wait a long time for the refund.

It’s better to omit the second instance of “you.” “If you shop online and accidentally choose …”

Generally, I don't usually shop online and neither do I in person, because I don't have enough money to wast ite buying clothes that I do not need.

Since the word "generally" was already used, "usually" is redundant. Also, you usually don't need a comma before "because."

If you shop online and you choose accidentally a wrong sizethe wrong size accidentally, you have to do a boring proccess for the return and wait a long time for the refund.

I can't necessarily explain why "accidentally" should be at the end instead of in the middle, but it definitely sounds more natural.