What factors would you consider to decide the target audience of your Ad? 

With YouTube Analytics, you can track metrics on Playback locations. Playback locations gives you how many views your channel got and what videos they watched. 

With YouTube Analytics we can Find out who's watching, what they like to watch, and which videos could make you the most money.

By monitoring ad campaign performance an advertiser may obtain the information needed to determine if campaigns are meeting overall marketing and conversion goals compare campaign performance to that of other advertisers create separate adwords accounts for low-performing keywords create duplicate ad groups with identical keywords and different ad variations.

Higher Quality Scores typically result in lower costs and better ad positions. Quality Score is Google's rating of the quality and relevance of both your keywords and PPC ads. It is used to determine your cost per click (CPC) and multiplied by your maximum bid to determine your ad rank in the ad auction process.

Display Planner is a free Google Ads tool you can use to plan your Display Network ad campaigns.

When someone clicks your ad, the actual amount you’re charged will be " The minimum needed to hold your ad position, under the maximum cost-per-click limit ".