Can somebody help me understand why it is "lite" instead of "litt"? The description said adjective end in -e when they are plural or definite. This is singular and indefinite...
"liten" is a highly irregular adjective. The description gives a special table for when to use liten/lita/lite / små.
Are "små" and "lite" almost synonyms like in English, or do they have distinct contextual/grammatical uses?
I would say it is the same, except små is plural, lite is neutral and liten is male/female - et lite barn, en liten gutt, to små gutter
Irregular adjective with different forms. There is also another form if you use the other feminine form "ei lita bok" and another form "lille" is used with singular definite for all the genders, while "små" is used for all plurals both indefinite and definite. Scroll all the way down on the Adjective unit page for the tips and notes on the web version of Duolingo.
Our comparative forms "good, better best" and "bad, worse, worst" must also be confusing to people learning English.