A lot of things are a matter of whether or not your child is extremely curious. We could not predict a lot of what we've had to do. For example, we have a gate blocking off our stairs since we live in a duplex--upstairs is only sleeping and a bath. Now our gate is also covered in cardboard with duct tape since the kids were able to break out rungs and reach beyond to get into things they are not allowed to get into.
Our DVD tower doors have strap latches on them like the one on our fridge and microwave (exploding Hot Wheels? NO thank you!). Crawling can lead to pulling up on things, so make sure your tall furniture (or even not-so-tall) is anchored. I just use regular drywall screws through the backs of our bookshelves since they have the heavy cardboard backs. Our DVD tower is anchored at the top to our stair railing so the kids can't pull it over, all of our door knobs have knob covers (highly recommend!!), and we have the latches on our drawers and cupboards that have a hook inside so you have to press down inside the edge to open them. If you have exterior knobs there are other other latches that don't have to be installed.
We used cheap pressure gates for the kids' doorway and base of our stairs until they were old enough to climb them or knock them down. Depending on your child's ingenuity, you might consider something that will keep your windows from opening more than 4 inches or so, or opening them from the top. Our oldest pushed our cat out through a screen and found a large toy and climbed out the window after him (18 months old). We also bought knob covers for our stove, but the kids just pulled them off with the knobs inside and used them for rattles, so I would wait and see if you need such a thing. We just took the knobs off and pull them out if we have to use the stove.
You may find yourself getting creative. For a while we stored our dining chairs in our bathroom since the kids were always using them to get onto things, then we started just tying the legs to the table legs. That worked until the kids got strong enough to drag the table, too. Cover the basics like a pressure gate or two, outlet covers, drawers and cupboards, and doorknob covers. The rest you may or may not need but will figure out as your child becomes more mobile. =)