-- Boredom
As a father my main job is to make sure my children are bored out of their minds as often as possible. That's where innovation and the ability to figure out how to cope with boredom by themselves comes from. There are actual studies about this [0][1][2]
They do have the tools to make boredom go away, Legos, art supplies, different building blocks and in a pinch, books. No passive consumption devices.
We can go on a 1-2 hour car drive without any devices and nobody is bored, we may listen to a podcast/audiobook together, but it's not a requirement. Now my kid can easily forget their phone at home and not be stressed at all. Does better at it than their parents :D
[0] https://www.sciencealert.com/technology-is-saving-you-from-p...
[1] https://www.forbes.com/sites/forbescoachescouncil/2020/07/15...
[2] https://www.bbc.com/culture/article/20200522-how-boredom-can...
-- Technology
I got my kid an iPad as soon as they could interact with it. There are some baby-level apps that mostly just make sounds and nice colors when you slap the screen.
The goal is to get to a point where they are comfortable with tech, but not addicted to it. You should be able to take the tablet away at any point without a tantrum, with an explanation or alternative task of course.
We use the iOS integrated Screen Time heavily and asking for more screen time is a routine now. The limits are pretty low and they know how to ration screen time when needed. (No Pokémon from Netflix in the morning, because they want to watch it longer after school).
X minutes of reading always gives 2X of screen time (at the moment, ratio may change without notice).
-- Misc
Just be there, that's the biggest bit. Make sure the kids know they can always talk to you about anything without judgement or ridicule. If you build that trust when they're young, it's still there when they're teenagers and _really_ need it.
I've had a "night-time chat" with my kid since they could form words and a decade later it's still a routine they love (and ask for specifically). And it's the place where they feel safe to vent about stuff that's bothering them at school or otherwise or ask highly philosophical questions that I struggle to give answers to :)
Lots of different experiences is good too, the child doesn't know what they like so giving them the chance to try a bunch of different things helps them find their own niche.