to the video below: if you are REALLY new you should NOT use platforms, its cheaper to just build a house and "live" with the other NPC(s) (often the guide)

the ones below are on single specific, yet crucial tutorials

fishing may seem boring, yet is very rewarding and can easily give you one of the best pick axes and axes (chainsaw)
the eye of cthulu looks very hard but actually is very easy, it can be beaten with any ranged weapon or throwable and can be beaten in short time with just 1 other person

the ALTARS are very useful for spawning bosses.
if your evil is "corruption" it will look like a gray table with teeth or horns on top.
if your evil is "crimson" it will look like a red table with eyes on top and will glow red.
altars can spawn in random places and often underground, but near to the surface
https://terraria.gamepedia.com/Altars


if you are unsure about ANYTHING, use the WIKI https://terraria.gamepedia.com/Terraria_Wiki
it looks complicated at first but is very easy to navigate and search what items/npc's/enemies/biomes and much more do and can be done with



https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1795903136 a helpful guide to get to the ocean/ get across crimson/corruption