How to make a start in a new build
Get a trowel, peel off a corner of the turf that's been plonked on top of the rubble, sand and general building crap, stick the trowel in, realise it's all rubble, sand and building crap, go and have a cuppa before deciding it's better to start with pots and going over the turf with a fork to try and get at least some of it to take before it all dies. Then work out if you've actually got any wildlife in there yet - nothing's going to grow if there aren't worms.
How to work out north facing versus north aspect and plant for either
Take out your phone, open Uber and the top of the map is north - if that's in your line of sight as you sit on the back doorstep, you've got a northfacing garden. Assuming there aren't blocks of flats in the way, you'll get light but not necessarily direct sunshine, which is the northfacing aspect. Green stuff works on both, things that need to ripen (like tomatoes) probably won't. Airflow is probably as important. And don't forget that a northfacing back garden will mean that you probably have a southfacing front - so what's there will likely bake all summer (so we're looking at stuff like lavender, Rosemary, harder herbs).
How to properly install waterbutts and store water for the summer
If you've not got one put into the newbuild as part of their environmental certificate, put one up on cinder blocks (so you have space to fit a watering can), make sure the top is covered to avoid drowning foxes, cats and providing a lovely home for mosquitoes and get somebody in to connect it to your downpipe.
How to manage bad soil
What's 'bad'? Clay - plant roses, add sand/bag of top soil specifically where you're planting something else. When emptying pots or tubs (like after harvesting spuds), chuck it in a corner and scrag it in a bit. Sandy/Gritty/Dry - add bag of peat free compost (Dalefoot is a good brand)/bag of top soil. Plant spuds.
How to tackle an overgrown garden you just moved into
Have a cuppa. Wear thick clothes, gloves, boots and a hat. Start at the nearest bit and gradually cut things back. You never know what you'll find in there, so be careful. Make sure you have a clear run to the back door, as this is where you could find a wasp minding her own business at this time of year or a somewhat startled fox, never mind the detritus from a previous human resident.
How to set up small seed growing space in a tiny house with cats
Buy the lid as well and make sure you aren't putting it in the perfect place for observing pigeons or shouting at outside cats/squirrels.
How to choose your colour palette for big impact in small spaces
Pick what you like. If all else fails, Nasturtiums for short term, all that orange, yellow and red really stands out against greenery.
How to make large amounts of compost, quickly
Doesn't quite work like that. Especially if you don't have worms in the ground. Start in a bin/tub and chuck in some handfuls of Dalefoot and a few worms to get things started.
How to dispose of huge amounts of waste without just chucking it into a bin.
If it's an overgrown newbuild, you might not want to - there could be invasive species in there. Use the local authority green waste service if they have one - but make sure any size limitations (no half trees, for example) are followed. Easiest thing is not to create huge amounts of waste at once - stop for a cuppa once you've got 2 bin bags worth.