The Pillar 3a Tutorial

HI everyone,
forgive me as I will be asking extremely basic questions. I’m new to all of this and would really like to get more familiar. Thank you for the tutorial. Here are my questions/confusions.

  1. I just turned 30, is it still worth investing in pillar 3a? Or should I focus on somewhere else?
  2. It is mentioned that with pillar 3a, I can fill it with ETFs/stocks etc. of my choice. So I still need to pick out these things? I thought I could just set a monthly deposit in the pillar 3a and that was the end of that?
  3. I am currently with UBS. Any opinions on their savings/pillar 3a accounts?
  4. Aside from pillar 3a, I would also like to start investing my money elsewhere (other than savings account) for long term. I like to keep things simple and it seems index funds is the way to go. I am also thinking of finding a few (possibly the 3 fund portfolio I see here) and setting up a monthly deposit to these after the initial minimum. Any advice on how to start out?