There are many tutorials on surface mount soldering on the net - there are several techniques depending
on what equipment you have. Common to all is a requirement for flux - using just rosin-cored solder is
possible, but having more flux will increase chances of success. Common mistake is using too much
solder - use as little as possible. Practice will help, which means having some spare cheap components and
pcb.
Use SMT and surface mount in your search string, you'll find many videos.