By adding a solid-state drive to a budget laptop, either as a hard-drive replacement or companion, you can realize noticeable gains and get additional life from your portable PC.
How to know if my laptop has an M.2 SSD socket - Quora
HP 15-dw SSD Replacement - iFixit Repair Guide
HP 15-dw SSD Replacement - iFixit Repair Guide
How to Install an M.2 SSD - Kingston Technology
2nd HDD SSD Caddy SATA3 Second Solid State Drive Enclosure for Asus Laptop X555LN X555D X555DA X550V X550VX X750 X555DA X751M X751L X541 X541N X541U, Internal CD DVD BD Optical Drive
Can we replace a CD drive with an HDD/SSD in any laptop? - Quora
How to Install an SSD in Your Laptop (with Pictures) - wikiHow
How to Install a Second SSD
Turbocharge Your Laptop By Installing an SSD Yourself