Revise the following to avoid redundancies. Because his laptop was small

Revise the following to avoid redundancies.
Because his laptop was small in size, he could carry it everywhere.
1. A basic fundamental of computer safety is to avoid storing your password on a file in your computer because criminals will look there first.
2. The manager repeated again his warning that we must use strong passwords.
3. Although the two files seem exactly identical, we should proofread each and every page.