Adding Special Characters
In Windows you can bring up the Character Map application to select and insert special characters into documents. In MacOS there is similar functionality and I think it is easier to use.
Under the Edit menu in the menu bar in most (all?) applications at the bottom is the Special Characters… command. Select it and the Characters window will open. Select any character in that window and then click on the Insert with Font button and that character will be inserted whereever the cursor is located.
MacOS provides a very useful feature not found in Windows. If there are characters that you need frequently then you can add them to the Favorites list. With a character selected, click on the operations pull down menu in the lower left of the window and select Add to Favorites. There is a Favorites tab towards the top that will show all your favorites and you can select from them just as you would any character from the catalog.
Here’s a bonus tip: choose Glyph from the View pull down menu and then Lucida Grande as the Font. This is a motherlode of Apple characters including those from foreign languages and even the symbols used for special keys on an Apple keyboard.
Now you can enter ? ? and other non-standard symbols that can’t be entered from a keyboard into your documents.