Word allows you to create a Table of Contents automatically. It searches headings in your document and creates contents according to them. Headings must be set via headings styles in tab "Home".

To create a Table of Contents Contents in Microsoft Word, you should go to tab References, press button "Table of Contents" and choose "Automatic Table 1", "Automatic Table 2" or "Manual table" (Figure 1).

If you modify your document, you can easily update your Table of Contents. You should select the Table of Contents and choose "Update table" (Figure 2).