Sarinha, one (inexpensive) way to correct your texts (word spelling, I mean) would be to install the Libre Office program, and you would use the Writer (equivalent to the Word, of the Microsoft Word package, only that´s for free.

You would use the English Dictionary there to spell-check your texts, before you gave them a thumbs-up.

Of course, it doesn´t proof read for grammar or other content criteria, but it´s a beggining... we know that any piece of text needs the human proofreading afterwards, but any (automated) help backing up the human work is inestimable.

And congrats on your courage, it´s a display that you really are out to learn English.

You make mistakes, you learn from them, it´s the way it works!