How to build a outdoor deck ?

I've not used those but my SIL did for his parents. He was told to place them 6" into the ground. The recommendations I have seen show no more then 5' apart.

Before you do anything, check your local building code. And if attached to a structure, there are specific rules to follow. Here are a couple of non dig options. Just be careful, your family and friends will be at risk if not constructed properly.

https://suggesthow.com/how-to-build-a-deck-without-digging-holes/

https://www.hunker.com/12001846/how-to-build-a-deck-without-digging-holes

You may want to check with building codes in your area first. Using blocks and not digging below the frost line will cause future problems.

Hi there here's a floor joist span and spacing calculator: https://www.decks.com/calculators/joist-span-calculator It will tell you how far you can go between posts and how many joists you need. Hope that helps!

Here's some help

https://www.naturalhandyman.com/iip/infdeck/infgroundleveldeck.html

https://www.lowes.com/n/how-to/planning-a-floating-deck

https://blog.homedepot.com/tips-and-ideas-on-how-to-build-a-floating-deck/

https://rogueengineer.com/floating-deck-build/

Here you go https://www.youtube.com/watch?v=Z6fBHCBYyJY

Generally speaking, anything over 30" inches off the ground requires a permit no matter what the size. It will be subject to your town's deck building code. And, while a freestanding structure (not attached to the house) is not subject to the same regulations there are special regulations that apply. There are specifications for the stairs as well. If it's ground level, then you are good to go.

If you’re in a hot climate this may work well. But anywhere with freezing will be a challenge. Without footings the ground will heave and make your deck wonky. Sorry.

Here you go https://www.lowes.com/n/how-to/build-a-deck-design-and-layout

I would dig down a bit farther than the depth of you concrete blocks, and put in a base of gravel and then sand to set them into. https://www.youtube.com/watch?v=whpgIsFVtGk

4x10 deck... 6 blocks/footings will be more then enough

Hello Ven, hope this helps you out,

https://www.thespruce.com/how-to-build-floating-decks-2132000