I wouldn't go so far as to call this an "easy" project, but it is quite do-able if you have access to some basic woodworking tools.
For this project, you need to start off with a decent board. Look for a flat redwood board with consistent grain and very few knots (if any). I got my boards in the decking section of a large orange-themed home improvement store.
You can use any kind of wood of course, but redwood is advantageous for outdoor projects because it is naturally bug- and rot-resistant, much like cedar. Depending on where you live though, you may need to adapt this design and pattern to work with whatever materials are available to you.
You will need waterproof outdoor glue as well as exterior grade screws. I used 1 5/8" deck screws I had left over from building a fence, and they worked perfectly.
At minimum, you will need access to a band saw with at least 8" vertical capacity, a table saw, drill and driver.
If you even remotely dabble in woodworking, I highly recommend tapered countersinking drill bits. When assembling anything out of wood, these bits perform three functions at once: drill a pilot hole into the first board (where the screw should slip easily through without biting into the wood), countersink the first board for the head of the screw, and then drill a smaller hole into the second board (where the screw should bite into the wood and suck the two boards together like a clamp). They are completely adjustable and incredibly useful. I put them right up there with my band saw as favorite tools in my shop.
This is the set I have. They are pricey, but worth the investment. This DeWalt set is much cheaper, but still decent.
Regarding safety, you obviously know how the internet works by now, because well... here you are. Google things you want to learn about. Read up, watch videos. If you are using power tools, especially tools like band saws and table saws and are just ignorantly "winging it," you are going to lose digits and limbs. Plus you're going to make a real mess of your shop.
I've seen dried blood/bone/flesh muck intentionally left on walls of a cabinet shop as a reminder to pay attention and take proper safety precautions. I'll tell you, it was a disturbing yet effective approach to encouraging shop safety!
"What? Oh, that crud on the wall? Yeah, that's Ted's right hand."
So, be safe my internet friends.