Saved Locations are colloquially called Bookmarks.
Bookmarks are accessible in space by right-clicking empty space & hovering Locations or anywhere via the Locations and/or Local Locations windows.
Locations is bound to the L key by default; Local Locations is unbound (Escape → Shortcuts → Window → Local Locations).

Note: Jet-Perches and The Bookmark Barn sell tactical bookmarks for all KS regions in EVE at prices which are reasonable for established players. I'm not affiliated with either.
Guides for various types of bookmarks in descending order of importance:
  1. instant dock (instadocks are vital for trade hubs—Jita, Amarr, Dodixie, Hek—since you can be instantly destroyed when trying to dock without them):
    1. check if your corporation is under a war declaration. this crossed swords icon will appear if so. this means certain corps can freely attack you in High-Security space
      • if the icon appears and you're doing this in HS, consider doing it instead with an alt which remains in a starter corporation (which cannot have war declared on it)
    2. undock in something cheap & fast like one of the four fast frigates with a microwarpdrive fitted (and maybe overdrive injectors and/or nanofiber internal structures)
    3. double-click in space back toward the station model. if more speed is required, activate your MWD (you can also set a specific speed)
    4. save your instadock bookmark once you're at zero distance from the station and at a position which isn't causing your ship to bump off the station's model, then dock
      • Larenon en Marland's Station Cyno Placement Guide contains screenshots of good insta-dock placement locations for most NPC stations, but it's notably missing Jita 4-4
        • these locations were specifically chosen with use of Cynosural Fields in mind, which is not a beginner topic, but they work well as insta-docks, too
    5. usage: warp to the bookmark instead of the station & dock when you land
      • if a station or structure is your current Route destination, you can warp to an instadock BM for it then activate Autopilot mid-warp. your ship will auto-dock when it exits warp
  2. instant-undock (these are also vital for trade hubs, since ships can be destroyed while aligning for warp unless the warp destination is closely aligned to the undock vector):
    1. with a non-wardecced character, undock in a fast frigate
    2. enable the tactical overlay if it's not already
      • if you are not in an Amarr station:
        1. orient the camera so you're looking at the back of your ship & you have a rear view of the forward-facing numbered through-line which is aligned with the undock
          • the Jita 4-4 CNAP (EVE's main trade hub) has many undocks which point in different directions, not all of which line up with a through-line
            • it therefore annoyingly requires several instant-undock bookmarks. it's the only station like this; all others only need one insta-undock (though you can of course make several)
        2. double-click the 200 at the end of that through-line to make your ship start moving parallel to the undock, then activate your MWD
        3. once you're at least 175 km away from the station (but preferably quite a bit further), save your undock bookmark
          • on-grid probes are often a much faster alternative. launch & scan then check if a probe is on the through-line (it often is). if it is, simply save it as your instant-undock BM
      • if you are in an Amarr station:
        1. either use probes to make a bookmark, or double-click straight down (or straight up, if you're in an Amarr Station Hub) then activate your MWD and burn
          • you can tell if you're going straight down by rotating the camera so it's above your ship and then spinning it around & looking to see if the trajectory-indicating circle stays fixed
    3. usage: after undocking, warp first to the instant undock before warping elsewhere
  3. perch (aka ping, tactical, tac, bounce, observation):
  4. safespot:
  5. dscan (aka offgrid):
    1. hit Control + B while you're still in warp to something you want to create a dscan perch on
    2. save the BM when you're between 14.2 AU and ~50,000 km from the destination (closer minimizes warp-to time, farther avoids being one-shot combat probed)
    3. usage: warp to the dscan BM instead of the location of interest so you can dscan said location without your ship appearing there
  6. specialized bookmarks:

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