I couldnt find the info about giving best answer. I'm sorry if I missed it. Can I give best answer for the thread I'm creating? Sometimes only I'm seeing this message "If someone posts a solution, use the "Best Answer" link in their post to pick it as the best answer."
It's usually at the bottom of the post you want to set as best answer, next to the "IP & Report" link: Just remember not all forum sections have the option to set a best answer.
To get the hang of it, try setting the post above as the BEST ANSWER to this thread. And only the person who starts a thread has this privilege.
It also isn't available in all forum areas. For example people aren't asking questions in the Buy/Sell/Trade areas. Not all forum sections have the option to set a best answer.
For eg, I started this thread under Google Plus: https://forums.digitalpoint.com/threads/about-google-plus.2717684/ There's no best answer link.
Not opposed to adding it to more sections, if it's a legitimate area, we've added the function to more areas.