How to insert a pictures into a Word document
- Place mouse cursor in the document where you want to insert the picture
- On the ribbon menu, under the tab Insert, within the group Illustrations, click Pictures. The Insert Picture dialog box appears.
- Browse and select the picture from your system.
- Click Insert. Word inserts the picture in the cursor position.
Shortcut key method to insert a picture
- Place the cursor in the document where you want to insert the picture.
- Press the ALT key and then press keys N and P one after another. The Insert Picture dialog box appears.
- Follow steps 3 and 4 of the above procedure.
How to insert pictures from an online source
- Place mouse cursor in the document where you want to insert the picture.
- On the ribbon menu, under the tab Insert, within the group Illustrations, click Online Pictures. Insert Picture dialog box appears.
- You can either search free clip art pictures in Office.com (royalty free) or search images in entire Internet world using Bing search engine.
- Select an image and click Insert.
MS Word Know How 
What do you mean by inserting pictures offline?
Adding a picture from your local machine drive is what is meant by inserting a picture offline.