How can you do guest posting ?
The approach that you want to take into doing guest posting is to write it with substance. People used to get into trouble for guest posting because they looked at it as a way to gain backlinks without thinking about offering something meaningful "first". To guest post the right way, you should be thinking about at least 500 to 1000 words of content. Yes, it needs to be in laymens terms, "kinda long". In fact, I would suggest that 500 words will still struggle to compete with the other guest posts out there that are far longer.
My advice is not to say, write for lengths sake, but again writing a guest post should be approached with the same mindset of writing a real blog post. If you follow the same rules that would apply to a traditional blog post, your guest post will be far more successful.