Today i start to write in langcorrect my journal to learn english

Today, i start to write in LangCorrect my journal to learn English.
You could also say, "Today, I'm starting to write my journals in LangCorrect to learn English."

"LangCorrect" is how the resource LangCorrect actually styles itself! You don't need to follow this style but it would seem right to do so: it's up to you!
The words, "start", "begin" and "commence" all mean the same sort of thing, although sometimes one of the three words sounds more natural in a sentence, depending on the context. You may often come across other such word combinations in English (called synonyms). This just reflects that the language has developed from a number of other languages. Another example would be: big, large, great.

Today i startI begin to write in langcorrect my journals to learn eEnglish on langcorrect.