The A620 can take some remarkable shots on auto but please play around with all the setting variables the A620 has and read the manual because it is a great place to start and learn what this little baby can do.  Unlike print film with digital the results are right now and there is no film processing costs. 

Always carry extra batteries.  The A620 uses AA batteries which were on the top of my list for convenience as every store carries this size battery.

Purchase an extra memory chip and carry it also.  Learn how to use the movie option this camera has. 

Practice, Practice and then Practice some more so it all becomes a reflex movement not a thinking movement to take THE shot. 

If you do not have an A620 do not despair as most of the digitals on the market are very similar

Happy shooting

Al