To speed up your writing, your phone can guess what you are starting to write.
Predictive text is based on a built-in dictionary to which you can add new words. This feature is not available for all languages.
Select Settings and Phone > Language > Writing language, and select a language and Word suggestion.
Start writing a word.
Your phone suggests possible words as you write. When the correct word is shown, select the word.
Select the word you have written in the candidate bar.