To be honest with you, NOWADAYS, in internet marketing INCASE you are starting with no investment, then do not expect (as you have mentioned), to expect fast results, or rather INCASE you are starting with no investment, do not expect profits to "happen" fast.
One of the many ways to start with no "direct" investment, would be to create a YouTube channel related to your interests, passion(s) and skill(s). It may quite obviously require indirect investment, though, just as almost all other internet marketing endeavours (NOWADAYS), would require atleast some amount of "indirect investment such as buying some software, buying some recording equipment, buying proxies, buying a virtual number for 1 time sms verification, buying a VPN, buying a VPS, buying a logo, etc, etc, etc.
The first step towards a higher chance at succeeding in internet marketing, (NOWADAYS), is to be realistic and set correct expectations and I hope this reply of mine, with the information I have provided (in the paragraph above this paragraph), will help you in setting your expectations correctly.
Another important tip : Do not believe "100% passive income on 100% auto-pilot mode, set it up in just 10 minutes and then completely forget about it forvever and it will earn you awesome profits forever and you will also become a millionaire within 3 to 6 months ". This is no longer possible NOWADAYS. It MAY have been possible only in the 80' and only upto the end of the 80's, when the internet was invented / launched. All such "income dream" sellers are "gurus" selling nothing but https://en.wikipedia.org/wiki/Snake_oil. They will provide the dream to you, free of cost, then once you fall for it, the hustle will be sold to you separately (in a very attractive and "shiny package").
But, why am I mentioning all this ? Because (as per what YOU have VERY CLEARLY mentioned), you are looking for fast results in internet marketing, without making any investment, and these "gurus" selling snake oil, prey on people looking to make fast money in internet marketing and they are experts in sucking money from people who initially thought they would do without any investment.
IF you have no investment for starting with internet marketing, then find a job, work hard, save money for 6 to 8 months and then think about getting into internet marketing.