Hello, I'm expert php developer, i will develop my own website from scratch, i put big effort in it, i will build it so it be search engine friendly ...etc I'm not sure what niche to choose, what are good keywords?? basically my website will be a blog there will be various articles, applications etc ideas please
An expert webmaster will never tell you there keywords. It depends on your niche. Use google keyowrd tool and target HIGH SEARCH VOLUME, HIGH CPC and LOW COMPETITION keywords. But you can google "kettlebags" hope that helps.
You might consider answering people's common questions being that you know a lot about programming. Write posts and make videos explaining how to fix this and that. You could then offer your services per hour to fix people's individual programming issues.
You can use google adwords to help you choose Keywords. Then do not choose the one which are much too people search for and little people search for.
It depends upon whats the goal of your site. Whether you are building it for Adsense or want to sell products? You first have to decide your niche . Great way of doing it is just build site about your hobby or passion.