You could call me a Socialist, and I would be fine with it. However, I would never support an authoritarian or non-democratic system. In my opinion my country has the best political system which currently exists, so I feel fortunate for that. Still, I don't find it to be perfect. Too much lobby-ism, aka. corruption. Too much influence by industries. At least everyone has a vote and everyone can technically start a process to bring change.
Healthcare, critical infrastructure, essentials and maybe more should belong to the people of a country. The US seems to be a country belonging to those who own the most of it. Businessmen, politicians and so on. Markets have to be regulated and controlled. Tax avoidance is no different to me than tax evasion. Yada yada, feel free to ask more questions about my opinions, but I guess this is a good start.
You'll have to clarify specific policies because saying you support Bernie Sanders just makes it even murkier.