For a small portfolio a single home page with all of your portfolio items on may be sufficient, but it is common to want to showcase work in 'Collections' of portfolio pieces. Common collections are by type, use case or publication.
You can then assign portfolio items to each block with the two options below:
Manually assigning portfolio items to blocks
The default of way of adding and removing articles from a block.
Automatically assigning portfolio items to blocks
How to use rules to automatically assign articles to blocks, great for if you have a large number of articles to display.