You’ll first need to sort the two files into new temporary files that are ordered:
sort -o tmp1.txt File1.txt && sort -o tmp2.txt File2.txt

You can then compare the new temporary files:

lines common to both files:
comm -12 tmp1.txt tmp2.txt

lines only in file 2
comm -13 tmp1.txt tmp2.txt

lines only in file 1
comm -23 tmp1.txt tmp2.txt