Forums are great ways to learn more, clear doubts and you can also create backlinks.
Just make sure you don't spam. Rather using content links that are helpful for the people in the forum. Then everyone will support you.
You can place links like the following example:
- Direct link: moz.com
- Using anchors: <a href="https://moz.com">Moz Website</a>
In the second option above the tag will hide if HTML is allowed then only the text will be shown. Else the first choice is preferable.
Hope it helps!
