Hi Jibril,
here’s video tutorial for the slider: https://www.youtube.com/watch?v=rbLe74GNCzk.
Complete list of tutorials for Ceckito theme:
https://www.youtube.com/channel/UCZp9vUjm0datjYwAan5k83Q
To setup portfolio, go to portfolio shortcode, open it, and it will ask you to install custom content portfolio plugin by Justin Tadlock (when you click on a link in shortcode, it’ll lead you directly to plugin installation page, and plugin will be listed first).
Install the plugin, activate and add content to it. Then go back to the shortcode and shortcode options will show now.
Let us know if you have any questions.
Regards,
Sinisa