Saved Locations in EVE Online are often called Bookmarks or BMs.

They're points in space which you can align or warp to by right-clicking, using the Radial menu, or
hotkey-clickingi.e. holding down a key and clicking while doing so

note: hotkey-clicking works on BMs in space and in the overview, but not on BMs in other windows
(by default, A = align, S = warp).
To save a BM of an object (e.g. a beacon, star, or station), right-click → Save Location. To save your ship's current location in space, hit Control + B then Enter.
Saved BMs can be seen in space, in the Solar System Map (F9), by right-clicking empty space and hovering Locations, and in the Locations or Local Locations windows.
L is the default Locations shortcut. Local Locations, which shows only BMs in the current system, is unbound (Escape → Shortcuts → Window → Local Locations).

Bookmark Barn and Jet-Perches sell access to BM packs for all regions in EVE. I'm unaffiliated. Some corps/alliances offer BM packs to members.
Name BMs consistently so they're easy to read at a glance. Warning: if you're BMing in busy HS and
a crossed swords icon appears at the top leftlocation & graphic of War Declaration indicator

this indicates an active War Declaration which means some players can freely attack you in HS
, make an alt for the task.

Instadock

Vital for stations, especially if they're trade hubs or regular stops or are in LS, NS, Pochven, or Thera. Also nice for structures, but not vital for them because of tether.
If you dock at a station without using an instadock, your ship can be instantly destroyed after exiting warp.
Click to show/hide an explanation of why.

Insta-undock

Also vital for stations, since ships can be destroyed at any station in EVE after warping off if the align for the warp takes longer than one tick.

Perches

AKA bounces, pings, tacs, tacticals. They're for visually surveying grids, dscanning grids without appearing on them, juking interdiction/bombs/SBs/lances, etc.
Objects near a destination (e.g. planets, moons, structures) can be useful ad hoc perches, but not always! Competently-made perch BMs will almost always be superior.

Safespots

AKA safes, tranquil bivouacs, cozy wilderness campfires... None of these are 100% safe! You can be probed anywhere if uncloaked, except in the Abyss.

Specialized BMs

A miscellany of BM types. A smorgasbord, a grab-bag, a mishmash, even.

EVE resources index. If you feel generous, I'm Jambe N'det in EVE, Jambeeno on Discord if you wanna chat. EVE Online and the EVE logo are registered trademarks of CCP hf. All rights reserved. Full copyright notice. Jambeeno.com is provided under a Creative Commons Attribution 4.0. I save no information about you.