How to translate my website automatically

Question

I am developing a site (www.asbesc.org.br) for my uncle and the same needs the site to stay in up to 3 languages, but I have no idea how to do this, a friend told me that PHP would work as follows:

I would create 3 folders, each one containing your texts in each specific language and then call a function to know what is the language of the person’s browser and then come a condition if the language is 'such' redirected the user to the folder of that language, for example:

www.asbesc.org.br/en or www.asbesc.org.br/en

I don’t know if this is the right way to do it!