Lastly, keywords and phrases related to your main keywords can serve you just as well – even if they are low-volume. Use Keywords On Your Site EffectivelyFirst things first: how many keywords do you need to use on a page? In the Search engines tab, add where you want to check your rankings (search engine and location). To see how your keyword rankings change, run new scans on a regular basis. If your keyword rankings are high, great!