Looking to learn more about CR and FI.

I'm currently a sophomore looking to learn more about Fixed Income. This is my first post and I believe this is the right forum for this.

My previous experience has been mainly focused on equities with some experience in VC (Summer internships at 1 local AM firm as an ER analyst, 1 local HF as an ER analyst, and 1 On-Campus Impact VC Fund). As Ive been learning more from my undergrad degree in finance, I've also become interested in Fixed Income Investing. At this point I need to start fine tuning my recruiting for future internships and for FT offers. I am personally stuck between being interested in both equities and fixed income investing. Seeing as I eventually want to end up in Asset Management and I would need to essentially pick between the two to focus on throughout my career, I need to essentially get some exposure to CR as well. However, with the time I have left in school and to do Summer Internships, I don't think that I would have time to actually work somewhere and gain the experience I'd need to decide.

My question is two fold:
1. Without actually gaining work experience, what resources are available to me to both learn about and experience the fixed income world that would be helpful in me making a decision between FI AM and Buy Side Equities AM?
2. If I do end up in an ER role after graduation or in my junior summer, how possible is it to transfer from Buy side or Sell Side ER to either sell side CR or a role at an AM firm in FI?

Thank you,