One common mistake is trying to run traffic without understanding who they are targeting. Beginners sometimes send traffic to offers without checking if it matches the audience. This leads to low engagement and wasted ad spend. Another issue is launching campaigns without testing different creatives or landing pages. Without testing, it's hard to know what actually works. Some also ignore tracking, so they can't see which ad or keyword brings results. Skipping tracking makes it hard to optimize the campaign. Overbidding or underbidding on traffic is another problem. Spending too much too soon without data can drain the budget, and bidding too low might not get enough reach. Lastly, some beginners focus on broad geos instead of narrowing down to regions where the offer is accepted or converting. What are some things you've noticed that affect your campaign performance?