Digital Rights Management (DRM)
Steam Cloud is a feature of the Steam client that allows save game data to synced to the cloud. A list of Steam Cloud games can be searched for on Steam, though some games are not listed there even though they use Steam Cloud.
Steam Cloud implementation is very inconsistent among developers. Some choose to only sync configuration files, some force users to choose only a single slot to be synced. Some games list Steam Cloud as a feature, but do not sync any data whatsoever. Some examples of such games are Halo: Spartan Assault and Capsized.
Steam does not scale DPI properly over 100% DPI scale. Valve has still not implemented support for HiDPI resolutions.
Disable display scaling on high DPI settings
Steam sales occur on a regular basis, and can includes sales as high as 90% off. On any given date, a Steam sale will switch at 6pm UTC, e.g. a weekend sale may last from Thursday 6pm UTC to Monday 6pm UTC.
Daily deal or Today's deal
Single game only. Lasts for 48 hours from 6pm UTC every day.
Multiple games, highlighted on Store page in the 'Spotlight'. Lasts from Tuesday 6pm UTC to Thursday 6pm UTC.
Multiple games, highlighted on Store page in the 'Spotlight'. Lasts from Thursday 6pm UTC to Tuesday 6pm UTC.
Steam is famous for having long periods of deep discounts which apply to virtually its entire catalogue of games. During this period, Steam will usually run daily discounts, further slashing prices (as low as 90% off). Therefore it is a good idea to hold off buying a particular game unless the game is on a daily deal (or flash sale), or it is the last day of the sale.
During Steam sales, you can make sure you are getting the best price available by using a service like IsThereAnyDeal, CheapShark or SteamPrices, which compares pricing across multiple game stores/distributors/regions.