Are you annoyed by that auto-correct feature in Samsung phones like the S5 that auto corrects words you don’t want corrected?  People who type in other languages often want to turn off the auto correct feature.  Here is a video that shows you how.  The video is for the S4 but it is the same method for all Touchwhiz Samsung devices.  The below screenshot is one I took on Galaxy S5.  This also works for the S5 Mini.

Go to Settings > Language and input > Samsung Keyboard > Predictive text, turn it OFF.

Galaxy S5 disable spell check