WHAT IS THE DIFFERENCE FROM A FHA OR 203K LOAN

HELLO ALL. I'M NEW TO THE GROUP, SO DON'T LAUGH TO HARD AT ME. I HAVE 3 RENTALS AND ALL HAVE BEEN CREATED WITH A CONSTRUCTION LOAN THEN ROLLING INTO A 5 YEAR ARM AT THE LOCAL BANK. BY LISTENING TO THE PODCAST I'M HEARING A LOT ABOUT "FHA LOANS" (DO THEY COME WITH A LONGER LOCKED IN TERM? WHAT IS THE DIFFERENCE FROM A FHA AND 203K? WHICH WOULD BE BEST TYPE OF LOAN TO GET IN MY SITUATION? (I JUST WOULD LIKE TO LEARN MORE ABOUT LOANS AND KNOW WHAT TO LOOK FOR-WHO TO GET THEM FROM) I PLAN TO GET ANOTHER RENTAL AND JUST WANTED TO SEE IF I NEED TO GO A DIFFERENT ROUTE ON LOANS. THANKS-