How I start steps to paint ?

Scrap off as much as paint as possible then strip it before painting

Scrape the loose paint, sand it smooth, and then prime and paint.

Scrape all loose paint off. Sand smooth. Wipe down with TSP. Prime and paint with a good exterior door paint. I would recommend Sherwin Williams.

Scraping, sanding and cleaning are all good beginnings but instead of paint look at exterior colored stains. It doesn't chip away but slowly fades. You may consider an awning to prevent weather damage in the future.

Scrape off as much of the peeling paint as you can. If it' is still uneven apply Citristrip paint remover according to product directions. Rinse well, then sand if it's needed. Primer with a good primer such as Kilz or Zinsser, then paint in the color of your choice using exterior paint. You could seal with a clear coat to make the new paint last even longer.

I would remove the door, place it on two saw horses then scrape off as much as you can, sand the rest smooth, then prime and paint as others suggested. I would wear a mask, too. You never know what kind of paint was on the old door before.

Scrape use a wood primer. Also use EXTERIOR wood paint. Ask at the paint counter for help in choosing.

Sand it down well, prime and repaint with a good semi gloss. Semigloss paint gives you a smoother surface than lower-sheen finishes and has a degree of shine, providing a visual contrast as well as being easier to clean then flat paint.

strip or scrap off the old paint then use a good primer and an exterior paint for the door...

This will show you how to scrape it off and start over so it is done and will hold up to the outdoors: https://www.youtube.com/watch?v=18euUWGx4tM

Scrape off any loose paint. Sand smooth feathering the edges. Prime with an exterior primer, then paint with an exterior paint.

I would remove the door. Then strip and sand all old paint off, then re finish..

Scrape all chipping paint off then lightly sand after your done then prime it then paint or you could just do 2 coats of paint

Is it wood or metal? You need to remove the old paint or as much peeling as possible then prime and paint.

Yes, I learned from all this. I will remove old paint, then sand, primer then paint, right? Thank you.