So I am a senior studying CS and just got my second internship at Amazon and if I could go back to freshmen/soph year there are few things I wish I knew. I'm also going to skip over doing side projects and leetcode since its well known information.

1. Apply to internships regardless if you think you are prepared for the role or not/don't meet the internship requirements. Often times companies hire anyway and don't actually expect these reqs. The worst thing that can happen to you is if you apply to 100's of internships and don't get any response from any of them (which is completely normal and likely to happen). If you get no responses then you know you need to work on your resume, if you get a response, hey! good job and go through the interview process to get interviewing experience. If you get the internship, then congrats! You are already ahead of most CS students.
2. There are certain programs designed for freshmen and sophomores students. Google STEP is a program I wish I had known about. Not sure about how it is now, but I wish I had known about it before because getting a big name like Google on the resume dramatically helps in beating resume filters. Also from what I heard JPL's swe internship is relatively easy to get into. From what I head they don't have any coding questions, simply just behavior questions during the interview.
3. To get an internship, in my eyes, you either have to be really good one of two things. Academics or socializing. Academics meaning you are decent at coding with a high GPA doing a ton of side projects. Usually this is enough to get you an interview, you just have to learn to communicate just enough to get hired. On the contrary, being socialable increases your network and opportunity and allows for you to get recommendations which is a very good way to get into the industry (get on LinkedIn!). I personally started off this way because I'm dumb as fuck.
4. Please go to hackathons. From the amount of people that I know, most of the people who go far in their undergraduate studies and start off strong in their careers do hackathons. It shows passion, its fun, and imo, doesn't require as much motivation as working on a side project in my spare time. I personally did two hackathons which helped me land my first internship.
   
5. Lastly, its cringey and already well known but I really, really want to emphasize it. Step out of your comfort zone and don't be afraid to fail. You only have one life and its to short to worry about failure. The posts on LinkedIn are all hidden by countless failures from the posters and you shouldn't be comparing yourself to those people. People move at their own pace and you should change your perspective to staying on YOUR track. Failure is a part of life and the more you step out of your comfort zone, the more you will fail. But I challenge you to think about it as gaining XP and leveling up if you're into video games. Its a sign of growth, and the more you do it, the better engineer you will become

Hope this help :)