I know that if our posts get deleted by the mods and there are many of them, it means that we are making low value posts, they are being reported and eventually getting deleted. In some cases, we may get tagged by the DT members for being a shit poster.
Anyhow I want to know that if we delete our posts ourselves, does it have a bad effect on our account and can we still get tagged or something or it is completely normal ?
Not deleting posts will be better, as BitcoinTalk is allowing you to edit, why not edit? It would be better to edit than delete a post, and also mostly newbies don't know how to post, so they post wrongly when someone reports to mode, and then the post is deleted, it is also an alert for the newbie or poster to post something constructive and ask something that is according to the topic, and he should make sure that is not out of the topic.
But the only thing you have to be very alert about is copying some other's post, this will affect your account badly and after that, you can't post anything through your account. So, make sure to keep yourself away from plagiarism and not copying others, otherwise, you can get a strong penalty for it.