The reason you're struggling, as you'd commented in the subdiv modeling sticky is because like most people new to hardsurface they'll initially see something badass cool then without a second thought to learning the basics: https://www.ebalstudios.com/blog/polygon-modeling-basics or any attempt to first properly blockout the main shape/s on a much simpler object to begin with, will invaribly eyes closed dive right in.
So really, do yourself a favour, drill down into the reasoning "why" things are done before asking "how".
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Hey!
it the upper stock which i marked it with red
that little shape
You might get a better response if you show pictures of what you've got so far and explain how you've got there so people can make suggestions
https://polycount.com/discussion/56014/how-the-f-do-i-model-this-reply-for-help-with-specific-shapes-post-attempt-before-asking/p165#latest
You'd still need to show your current progress in order to get proper answer.
Edit - I see you already found it.
https://www.ebalstudios.com/blog/polygon-modeling-basics
or any attempt to first properly blockout the main shape/s on a much simpler object to begin with, will invaribly eyes closed dive right in.
So really, do yourself a favour, drill down into the reasoning "why" things are done before asking "how".