i tried without single quotes and with it does not work.
$insert_query="INSERT INTO users_line
(name,surname,company_name,tel_number,cell_number,email,location,main_image,about_us)
VALUES('$name','$surname','$company_name','$tel_number','$cell_number','$email','$location','$main_image','$about_us')";
if(mysqli_query($connect,$insert_query==true)){
echo " <script>alert('successfully Posted') </script> ";
} else{ echo " h1> Did not work </h1>";