How to get into full stack development ?

Pretty much what the title says, which language should i choose ? and can anyone share some particular useful resources, free ones, or if the paid ones are better then those will work too, like some certification, i want to learn this skill to combine it with AI/ML further down the line, i have practically zero experience in both, i have finished second yr in college so i just know the basics of java, C and sql, and will full stack and ml be enough to land a goo