We are living through this right now, we are off around 2 to 3 hours at a time, twice or sometimes 3 times a day.
My tips that I can offer so far :
If your freezer isn't full keep some 2l bottles filled with water in there. Will help to not drop the temperature so much when it's off. Don't be tempted to open the freezer (or fridge unnecessarily while the power is off). Take what you need out the freezer earlier while power is on if you can.
Rechargeable or solar powered light. I have both, for different uses. The solar lights are outside so they come on in the dark and I don't have to remember to recharge as the solar panel is outside all day. Rechargeable for indoors as I forget to place them in a sunny spot a lot of the time. Rechargeable seem to hold power longer. Each person in the house has one, so we take it room to room, rather then having one in every room iyswim. We don't use candles as they are dangerous and make a mess. And they don't give sufficient light for if the DC are needing to study, wanting to read etc.
If you only have an electric hob, buy a camping gas stove and a gas kettle. If our power is out in the morning when I get up, I can make some coffee, as there is trouble ahead if I go without. You can cool one pot meals if you really need to with that too. (I have a gas hob so meal making is still possible). Outdoor gas bbqs also come in handy.
I wfh so I have a Ups which powers my wifi and laptop (also check your laptop battery is working OK) you can run a TV with the ups as well. Nothing too extreme like a printer though, you may need to look at inverters or a generator for a big office set up.
We know when we will go out as it's on a schedule, so I precook if possible, turn the geyzer on for an hour before if I need hot water during off time, charge the phone, iPad or whatever you need.
Charging banks are incredibly handy as a back up back up, incase one forgot to charge the phone / light (yes it's happens). Use your car to charge your phone while you are out and driving.
I have an electric garage door, so I'll take my car out the night before if need be, it's does have an override button, but it's a bit of a faff.
Make sure you have an extra set of keys if you (like me) enter the house via the electric garage door as the main door is them going to be more in use (and other members of the household don't always put the keys back where they should be).
Traffic will be a nightmare as traffic lights will be out. Drive carefully and try hard not to get impatient.
Turn off the plugs to appliances (tvs, pcs etc) when the power goes off. When it comes back on there may be surges which could blow the appliances. Also buy surge protectors and plug appliances into them.
Dust off your packs of cards and board games as they will no doubt get used. I have to say that the coming together family time with teens is really nice, doesn't happen that much these days.
Try not to let your hair get past out of control if you need to dry and straighten. This is my biggest complaint to which I haven't yet got a work around. If it's planned to be off early morning, then I wash and dry and style hair the night before, and just hope for the best with the bed head look the next day.
Plan ahead and try to be as prepared as possible.
That's all I can think of for now. I'll add more as they come to me.