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As stated in the about links on every page, Stack Exchange is a network of question and answer sites, not help forums. This implies that all posts are expected to have some value for later visitors too. To enforce that, and to prevent help vampires making the answerers turn away from the communities, low-quality questions and answers are blocked. This includes posts from:

Read the pages in the Help Center, particularly those about asking and the Stack Exchange model. Investigate and search before you ask. Put some effort in your questions.

• How to Ask from the Ask Ubuntu Help Center
• Writing the perfect question by Jon Skeet
• How to Ask Questions The Smart Way by Eric S. Raymond
• Getting Answers by Mike Ash

• Formatting help
• How do I format my code blocks?
• Try for yourself in the formatting sandbox

As stated in the about links on every page, Stack Exchange is a network of question and answer sites, not help forums. This implies that all posts are expected to have some value for later visitors too. To enforce that, and to prevent help vampires making the answerers turn away from the communities, low-quality questions and answers are blocked. This includes posts from:

Read the pages in the Help Center, particularly those about asking and the Stack Exchange model. Investigate and search before you ask. Put some effort in your questions.

• How to Ask from the Ask Ubuntu Help Center
• Writing the perfect question by Jon Skeet
• How to Ask Questions The Smart Way by Eric S. Raymond
• Getting Answers by Mike Ash

• Formatting help
• How do I format my code blocks?
• Try for yourself in the formatting sandbox

Yes, deleted questions (if less than 30 days old when deleted) and deleted answers count towards an automatic ban.

It's not a problem to have deleted posts. But if a large percentage of your posts are deleted by yourself or the community, then apparently they are not suitable for the site. Posting them consumes time from users who read them, edit them, or respond to them. Therefore deleted posts have an effect on the filter, among many other factors.

Beware that an account might very well have many deleted posts, including auto-deleted old low-score questions, all of which are only visible to moderators.

• Formatting help
• How do I format my code blocks?
• Try for yourself in the formatting sandbox

Note the emphasis on fixing. Do not delete your posts. As explained above, deleted questions (if less than 30 days old when deleted) do still count towards the question ban. Deleting your posts does not help to lift the ban. Only fixing does! Under some conditions you can see a list of your own deleted questions and answers.

If you are banned from asking questions, then writing a few quality answers that get upvoted might enable you to ask questions again. But as the internals of the filter are secret, there is no way to know for sure.

If you really, really think the ban is an error, then email the team directly using the "contact us" link provided at the bottom of every page. But note that reactivation of banned accounts is not a high priority.

No. The automatic ban is at a lower level than account.

Migrations are not possible if your account is banned from asking questions on the destination site. The question will simply be closed as off topic, but not migrated.

Yes, deleted questions (if less than 30 days old when deleted) and deleted answers count towards an automatic ban.

It's not a problem to have deleted posts. But if a large percentage of your posts are deleted by yourself or the community, then apparently they are not suitable for the site. Posting them consumes time from users who read them, edit them, or respond to them. Therefore deleted posts have an effect on the filter, among many other factors.

Beware that an account might very well have many deleted posts, including auto-deleted old low-score questions, all of which are only visible to moderators.

• Formatting help
• How do I format my code blocks?
• Try for yourself in the formatting sandbox

Note the emphasis on fixing. Do not delete your posts. As explained above, deleted questions (if less than 30 days old when deleted) do still count towards the question ban. Deleting your posts does not help to lift the ban. Only fixing does! Under some conditions you can see a list of your own deleted questions and answers.

If you are banned from asking questions, then writing a few quality answers that get upvoted might enable you to ask questions again. But as the internals of the filter are secret, there is no way to know for sure.

If you really, really think the ban is an error, then email the team directly using the "contact us" link provided at the bottom of every page. But note that reactivation of banned accounts is not a high priority.

No. The automatic ban is at a lower level than account.

Migrations are not possible if your account is banned from asking questions on the destination site. The question will simply be closed as off topic, but not migrated.

As stated in the about links on every page, the Stack Exchange web sites are question and answer sites, not help forums. This implies that all posts are expected to have some value for later visitors too. To enforce that, and to prevent help vampires making the answerers turn away from the communities, low-quality questions and answers are blocked. This includes posts from:

A ban is enforced automatically, and only prevents posting questions or answers. It is invisible to others.

Automatic bans never expire or "time out." This means that you cannot simply wait for a certain amount of time: if you do not take action, you will never be allowed to post again. The only way for the ban to be lifted is by contributing positively to the site in other ways. Also, moderators cannot lift the ban by request.

My account is in good standing how come I still get banned?

Since the ban is based on IP address as well, when you browse from a shared computer or from work location that give the same IP address to many end users it's enough that one get banned and all others are "banned" as well. To rectify this, just browse from a different location.

As stated in the about links on every page, Stack Exchange is a network of question and answer sites, not help forums. This implies that all posts are expected to have some value for later visitors too. To enforce that, and to prevent help vampires making the answerers turn away from the communities, low-quality questions and answers are blocked. This includes posts from:

A post ban is enforced automatically, and only prevents posting questions or answers. It is invisible to others.

Automatic bans never expire or "time out." This means that you cannot simply wait for a certain amount of time. If you do not take action, you will never be allowed to post again. The only way for the ban to be lifted is by contributing positively to the site in other ways.

Moderators cannot lift the ban.

My account is in good standing. Why am I still blocked?

The ban also takes in account the IP address. If you browse from a shared computer, or from a location that gives the same IP address to many end users, it's enough that another user who was banned or triggers the ban, will affect everyone else accessing from the same location. 

To help rectify this, browse from a different location.