Given you're Stage 0, you're at a very low risk of recurrence.
ER/PR indicate that the breast cancer cells (a tumor is a bundle of cells growing out of control) grow with the help of estrogen (the ER) and progesterone (PR) supplied by the body. This is why pills like Tamoxifen and Aromatase Inhibitors (AIs) are given, to deprive potential or existing cancer cells of the "food" hormones represent.
Her2/neu sits on the surface of breast cancer cells, also helping them to grow. Her2 is present in normal cells, but a biological mechanism (mutation, the neu part) has caused a high amount of these receptors in the surface of breast cancer cells. Herceptin is a drug that targets cancer cells that have Her2/neu, the Herceptin works like a key to the lock that's the her2/neu. Then the body's immune system destroys the cells that have been tagged by the Herceptin.
Triple positive is when a breast cancer has all of the above, ER, PR, and Her2. It's better to be triple positive than negative, as there are more drugs with which to slow/kill these cancer cells. I recently read some other "things" were being identified on triple negative cells,,which now can split those cancers into 3 types (so for now a diagnostic tool which hopefully soon will lead to medicine against them)