Make sure the free space on the HDD is never under 15% of total capacity of said drive.
Make sure the games are from legitimate sources and not potential infection sources.
Make sure you download games that can be reasonably run on that system, since laptops will overheat easier than desktops and they are not always placed under ideal cooling circumstances (running a game while the laptop is in your lap means obstructing bottom airflow ports, meaning overheating in turn). The CPU/GPU will throttle down when detecting overheating, but repeatedly reaching threshold temps can never be good).
Game on.