Personaly I tend to never buy things based on ads, and while I do understand how "generic" ads (those on TV, billboards, etc.) may actually work to "strengthen" some brand[0], I completely fail to understand how the so-called targeted ads on the internet can work.
Example of last week, I needed the mounting instructions for an industrial scaffolding that a friend of mine had bought (used) for his workshop, so I went to the manufacturer's site hoping to find it. I was lucky as the manual was still online even if the manufacturer has discontinued the product and is producing now high end mechanized/computerized storage scaffolding, and sure enough for a few days I had ads about these new industrial ones (that of course I will never buy, as I am not in the industry).
Then I bought online a (around 10 Euro value) a simplified TV remote for my mother, and for a few days I had ads for the same one that I just bought.
My usual approach is to search on monday for something (that I won't buy anyway, but that is anyway interesting to me) like "drones" or "laser cutter" so that I can have for the week related ads.
[0] I.e. after having seen tens or hundreds of ads about this exceptional soap for the dishwasher, and when/if I am at the supermarket and actually need some soap for the dishwasher, then I may fall for it and buy - to test it - one of those I saw.