Here are some tips and tricks that can help you when you are making a map:

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BANNERS:


If you want to have a banner like a flag, than use these two commands to help you:

Step 1. Summon the armor stand

/summon ArmorStand x y z {Invisible:1b,Invulnerable:1b,NoBasePlate:1b,Rotation:[90f],Pose:{Head:[90f,0f,90f]}}

(The Armor Stand can be rotated any way you want and the head can be also [270f,0f,0f or 270f] )

Step 2. Add the banner:
/replaceitem entity @e[type=ArmorStand] slot.armor.head banner 1 0 [Copy and paste a banner code here]

I recommend using an armor stand as the place hold the flag cause it is the easiet to use

To create banners and get their codes click here
To get already created banners and get their codes, click here

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ARMOR STANDS





There are LOTS of things to use armor stands for and lots of ways to edit them.

Here are tags to get custom armor stands:

{Invisible:1b} Turns the armor stand invisible and some reason is also invulnerable to be broken by player
{Invulnerable:1b} It turn it invulnerable (You can still punch it and break it, but it is invulnerable if it invisible)
{NoBasePlate:1b} Gets rid of the base plate of the armor stand
{NoGravity:1b} Makes the armor stand not fall down when summoned
{ShowArms:1b} Gives the armor stand arms which can also hold items
{Small:1b} Turns the armor stand into a smaller version of itself

Combination:

If you are trying to use more than one tag, you have to do it like this:
EXAMPLE:
/summon ArmorStand ~ ~ ~ {NoBasePlate:1b,NoGravity:1b,ShowArms:1b}

Entity Tags
/give @p minecraft:armor_stand 1 0 {EntityTag:{Tag}}

{EntityTag:{Fire:32767}} Sets armor stand on fire when you place it

Remember that armor stands can wear armor and heads and also hold items if they have arms

To get make custom armor stands click here

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WORLD GENERATION

This one is basically simple.
A superflat world preset text normally looks this:

3;1*minecraft:bedrock,7*minecraft:dirt,1*minecraft:grass;2;village

But you can change it around a lot!

There are other presets ingame that you can choose from. But you can also make your own superflat world

To make your own custom superflat world, click here

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Mobs



Summoning:

A simple way to summon mob is using its spawn egg or the summon command like this: /summon [Mob] x y z

But to get custom mobs wearing custom armor, you need to use a more complicated command.

Hidden Mobs

There are a few mobs in minecraft that can only get by using commands


Entity IDs

When you are trying to summon entities or mobs or do something with them, this may help you:


Data Tags can be used in the following commands:

To summon mobs with all sorts of tags, click here

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Minecraft Custom Heads



Custom Heads

There are two ways to get custom heads
The first one is this command that you can Minecraft Player skulls:

/give @p skull 1 3 {SkullOwner:"Username"}

But that is limited

This second one is complicated you can't exactly type in by yourself
You can get custom skulls by clicking here

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Here are some other links that may help you when dealing with commands:
Give Generator: click here
JSON Generator (Tellraw, Title, Book, etc.): click here

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If you need any help with anything not listed, comment what you need help with and I'll add it to this