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+*** Organisation #5: Emacs refresher
+**** Lecture content
+***** Objective: get confident with emacs commands
+***** Find out and document how to do the following steps
+****** DONE Search for something forward C-s
+       CLOSED: [2020-05-01 금 21:40]
+****** DONE How to continue searching C-s C-s
+       CLOSED: [2020-05-01 금 21:43]
+****** DONE Search for something backward C-r
+       CLOSED: [2020-05-01 금 21:55]
+****** DONE Search for regular expressions instead of string (forward, backward) C-M-s C-M-r
+       CLOSED: [2020-05-01 금 22:25]
+****** DONE Go to the beginning of the line C-a
+       CLOSED: [2020-05-01 금 22:16]
+****** DONE Go to the end of the line C-e
+       CLOSED: [2020-05-01 금 22:16]
+****** DONE Delete a word in front (to the right of the cursor) M-d
+       CLOSED: [2020-05-01 금 22:17]
+****** DONE Delete a word in back (to the left of the cursor) M-BackSpace
+       CLOSED: [2020-05-01 금 22:18]
+****** DONE List all "occurences" of a word in a file M-s o
+       CLOSED: [2020-05-01 금 22:53]
+******* You can copy above instructions into an emacs buffer
+******* And test it by showing all occurences of the word "Search"
+****** DONE Search (GREP) for a word in all files in a directory RECURSIVELY M-x rgrep
+       CLOSED: [2020-05-01 금 22:46]
+****** DONE Save the CURRENT buffer C-x C-s
+       CLOSED: [2020-05-01 금 21:55]
+****** DONE Save ALL open files C-x-s
+       CLOSED: [2020-05-01 금 22:22]
+****** DONE Split the window/buffer vertically C-x 2
+       CLOSED: [2020-05-01 금 21:48]
+****** DONE Split the window/buffer horizontally C-x 3
+       CLOSED: [2020-05-01 금 21:48]
+****** DONE Switch between the different windows C-x o
+       CLOSED: [2020-05-01 금 21:48]
+****** DONE Close all buffers besides the active one C-x 1
+       CLOSED: [2020-05-01 금 21:47]
+******* Don't kill it!
+****** DONE Close only the active buffer C-x 0
+       CLOSED: [2020-05-01 금 21:54]
+******* Don't kill it!
+****** DONE Kill the active buffer C-x k
+       CLOSED: [2020-05-01 금 21:44]
+****** DONE Describe/Explain the difference between closing and killing
+       CLOSED: [2020-05-01 금 22:09]
+******* closing is that emac do not display the buffer. and the contents on the buffer are kept on behined screen.
+******* killing is that emac delete the buffer. and if contents are not stored, it is losted
+****** DONE Switch between buffers that are not shown C-x b
+       CLOSED: [2020-05-01 금 21:51]
+******* DONE Document two very similar, but slightly different ways
+	 CLOSED: [2020-05-01 금 23:28]
+******** C-x b is that the selected buffer is displayed on the focused window
+******** C-x 4 b is that the selected buffer is displayed on the new window
+***** Outcome
+****** DONE Document all above commands in your learning org sheet
+       CLOSED: [2020-05-01 금 23:28]
+****** DONE Share your documentation at the end of the session (not before)
+       CLOSED: [2020-05-01 금 23:28]