You can simultaneously get both knowledge, skills and earnings.

Example: If you spend 3 hours per day on the forum, let's slit them into two parts for two purposes:

• 1 hour: for searching bounties (just an example) and finishing required tasks.
• 2 hours: for searching, reading, and learning about the forum (as many as possible), Bitcoin first then expand to cryptocurrency and other things relate to technicality (install, verify, use wallets, operation systems, security with browsers, passwords, phishing sites, and many many more things.

But if I was a newbie, I would have only spent all my time for the second purpose. Bounties are mostly zero value and you have to take risks (that you should not) - time, security, privacy, etc.