It is actually very easy! Give me a few fractions you do not understand and I will help you!
Take for example:
3/4 minus 2/4
just subtract the top numbers!
3-2=1
so, the answer is 1/4!
Now let's add fractions.
1/4 plus 2/4
again, just add the top numbers!
1+2=3
so, the answer is 3/4!