What do I need to do in my email marketing campaign so that I don't end up in spam?

Don't spam!! haha, just keep on track the things that will be really interesting for. your subscribers and make a form first how often would they love to receive emails and for what.

not use words in subject lines:"free, $$, discount etc most likely it will go to spam, not use gmail but use a dedicated smtp services like aws ses

Hi Yavuz, Emails land in spam due to various reasons - low deliverability, spam trigger content, poor targeting, low historical engagement etc. So you'd have to work on your overall email campaigns to improve the inbox placement rates. All of us are stretched for time, so we've chosen 21 must-do tasks to improve your emails and put it together in a structured 21 day Email Mastery Challenge. We launched it today, please check it out and upvote if you find it fruitful