When the scooter is nice and shiny clean, let your little one get used to the scooter indoors. They can hop on and off. Move it around by pushing it with their hands and really get used to the scooter without having the danger of falling off it outside. This will gradually increase their confidence.
They will probably explore the scooter first and see what they can do with it, without even scooting around on little bit. Let them sit on it, stand on it and use it how they would like (within reason at all). It won't be long before they will be whizzing around, there's no rush!
If you or an older sibling has a scooter you can show them how to scoot. Kids learn by copying, so let them watch you first. If nobody you know has a scooter, you could even show them a few videos on youtube. There's lots of little kids having a scoot around to show them what to do.
Before my youngest son had really got the hang of his scooter, I used to pull him around. He would stand on it and I would pull him around by the handlebars (slowly of course!). Little did I know at the time, you can buy straps which attach to the scooter and then you use to pull them along. It saveis a bit of backache! These straps are also useful when they are going a bit slow and you need to get somewhere quickly. You can use it to pull them along at the speed you want to go.
Small children will need to learn to balance a little in order to ride the scooter. You can encourage them to do this by doing little exercises. Get them to stand on the deck with two feet at first while holding onto the handlebars. Can they put one foot on the deck, and one foot on the ground while holding onto the handlbars. Can they lift the foot off the ground. Stand next to them to reassure them and be there if they loose their balance.
When you are learning outdoors, make sure you choose somewhere that is flat. If possible the surface should be smooth and not too hard in case they fall. Parks and playgrounds often have some great spongy, flat surfaces which will absorb any shocks if they fall. If you can choose is time when there aren't lots of other people around.
Kids get tired if they are made to learn something for a long time. I found the best way with my kids is to do 10 minutes every day rather than an hours on one day. Unless they are really enjoying it, then of course we would stay out longer.
Learning to scoot should be fun. Make sure that you don't forget that in your effort to get your little one scooting . It's easier to get carried away especially if they are making progress. But it can be easy to turn a fun session into one where there is lots of pressure and then their desire to learn can be affected,
It can be frustrating when your toddler doesn't get on the scooter and start to go within an hour. After all, lots of toddlers on youtube are doing it. Why not your little one. The great thing is that if you look closely you will see lots of small improvements they are making. There will be the first time when they lift their foot of the floor and balance just for a second. Blink and you may miss it. But those seconds grown. It's likely they will scoot frustratingly slowly at first, but it won't be long and you will be shouting at them to slow down. Notice and praise the progress when you see it!
A toddler will be more likely to succeed in riding a scooter easily if they have the right scooter to use. The handlebars should be about waist height, the wheels should be a little bigger than standard and give a nice, smooth ride. Read the best scooters for toddlers and the buying guide on scooters for kids to get some tips and ideas of what to look for.