do you mean this from here: https://helpx.adobe.com/after-effects/using/keyboard-shortcuts-reference.html
Go forward 1 frame – Page Down or Ctrl+Right Arrow/Page Down or Command+Right Arrow
Go forward 10 frames –Shift+Page Down or Ctrl+Shift+Right Arrow/Shift+Page Down or Command+Shift+Right Arrow
Go backward 1 frame – Page Up or Ctrl+Left Arrow/Page Up or Command+Left Arrow
Go backward 10 frames – Shift+Page Up or Ctrl+Shift+Left Arrow/Shift+Page Up or Command+Shift+Left Arrow
Go to layer In point – I
Go to layer Out point – O
Go to previous or next visible item in time ruler (keyframe, layer marker, work area beginning or end) – J or K
and use the Shift key as you move the CTI to snap to keyframes or layer edges
do you need anything more?