There are several ways to approach this!

First some definitions.

Clipboard: This is a storage space that exists within your computer. You cannot physically look to see what is there. (Well, you can but it is rather complicated - so, just pretend that you cannot! ) Once an item has been stored on your clipboard it will remain there until it is replaced, or until you turn your application off. So you can paste it multiple times!

Copy: You are taking a copy of the item and putting it on your clipboard. You are not removing it from where it currently resides.

Cut: You are removing the item from where it currently resides and putting it on your clipboard. (unless you are at a website - then you are only copying it!)

Highlight: You are using your left mouse key to select the item(s) you wish to copy or cut.

Paste: You are pasting the item that exists on your clipboard to the place your cursor has been established.

Okay now - how to:

Highlight: Place your cursor in front of the first item you wish to highlight. Click with your left mouse button. You will see that the first sentence (or in some cases the whole first line) is now shown in black outline with white lettering. This is highlighting.

If you want a single word or two simply hold down the left mouse button and move your cursor to the right end of whatever you choose to highlight, then release the button. If you want just a few lines you can follow that same instruction. However, if you wish to highlight a large number of lines, you can highlight the first line then (without clicking the mouse key again on the surface of the page) scroll down to the last line of the item you want. Hold down the shift key and only then press the left mouse button again. You will see that the entire item has now been highlighted.  A quicker method of copying an entire document is to place your cursor anywhere within that document and, holding down the 'Ctrl' key, press the key for the letter 'A'.  That is the computer's shortcut for "copy all". Be careful if you are trying to copy from a web page though as you may get way more information than you want!

Copy: There are several ways to accomplish a copy, some will work in some browsers and places and some will not - you'll have to play with it to know which one(s) work best for you. The first step in each method is to highlight the item(s) you wish to copy.

1. Click on the edit at the top of the screen using your left mouse button, and select 'copy' from the choices provided.
2. Hold down the Ctrl key and press the letter C.
3. Click on the copy icon on your toolbar.
4. Click on the highlighted area using the right mouse button. Select 'copy' from the choices provided.

Cut: There are several ways to accomplish a cut, some will work in some browsers and places and some will not - you'll have to play with it to know which one(s) work best for you. The first step in each method is to highlight the item(s) you wish to cut.

1. Click on the edit at the top of the screen using your left mouse button, and select 'cut' from the choices provided.
2. Hold down the Ctrl key and press the letter X.
3. Click on the cut icon on your toolbar.
4. Click on the highlighted area using the right mouse button. Select 'cut' from the choices provided.

Paste: There are several ways to accomplish a paste, some will work in some browsers and places and some will not - you'll have to play with it to know which one(s) work best for you. The first step in each method is to place your cursor in the exact spot you wish your item(s) to be placed.

1. Click on the edit at the top of the screen using your left mouse button, and select 'paste' from the choices provided.
2. Hold down the Ctrl key and press the letter V.
3. Click on the paste icon on your toolbar.
4. Click, using the right mouse button. Select 'paste' from the choices provided.

The last step in each case is the one that may not work in all areas.