Seeking Advice.

hey, i have started this thread because im seeking advice on how to maintain spanish and any other language. im not really used to studying language's so i dont really know how to start. The only experience i have is when i tried Dutch and Swedish. I failed on both of those but im trying to come back and try spanish and i need help. Any sort of reccomendation like litertature or anysort of app would be very helpful. thank you.