CS ENGINEERS HELP ME OUT

am a cs btech student who just entered their 3rd year. I didnt eally take my studies seriously till now and didnt do any extra work to acquire skills. Now that i want to study im confused as to where to start. I know C programming, Java, HTML, CSS, SQL...what more should i know to get placed. I have a decent cgpa till now. ALSO are those online certificates like udemy or coursera worth it? Please tell me where to start and what all to study to get placed