Good, Would like to participate in this thread by a simple questions:
1. What average amount would you ppl will suggest for advertisement to attract good download of his said app.
2. Which platform /medium will be better to get good amount of traffic.
3. What is the suitable time lenth to keep the advertisement live.
4. Will you suggest any geographical theory.
5. Should he (thread creator) target to age-bound advertisement or it should be free flow.
glad to help
1- that depends on his image and his network of connections. (idk if that applies to other countries but that is a sad truth in my country) otherwise depending on his app forte it can vary between 1 month or 1 year (Rome wasn't built in a year

)
2- again that depends on his country, advertising in instagram, facebook, quora, reddit, youtube, tiktok and so on. There are free ways but I would recommend advertising with influencers.
3- that was explained in 1
4- I do. better to start from a country which doesn't have strong rivals so you can work faster
5- again depends on his topic and app forte. he can use anything. (but I would not recommend age restriction cause who have a free time but teenagers and kids?)