I don't have it on Switch, but I've played it a lot on PC, and here are some tips!
- Don't be worried if it takes you a while to beat a boss. I almost always ended up looking up a guide for how to beat them, and it still took me a LOT of tries for most. Take breaks if you need to, look over your gear, and stock up on healing potions and items you can use to buff your character.
- I would build an
arena (warning for boss-related spoilers in that link). Personally, I like to use planter boxes, since they're faster to make, easier to build with, and a REALLY easy way of stockpiling potion materials. Unfortunately, they're also pretty expensive (particularly earlygame), so you might want to stockpile wood for platforms. It makes navigation a lot easier if you build a HUGE one across the length of your world, too.
- START WITH A SMALL WORLD. Large worlds are fun to play in, but I promise you it'll be so much more manageable with a smaller world. It'll be such a chore playing in a large world if you're going solo.
- A lot of crafting recipes are difficult to get to and take a lot of grinding. The Guide NPC, last time I played, had a function where you could see what you could craft off of an item that you gave to him, but I would recommend looking up a guide for the really complicated ones.
- Be prepared for a lot of grinding in general. In order to get the best gear, you're probably going to have to fight a lot of the same enemies over and over again. It's not necessary, but it can really help out if you're struggling with a boss or an area.
- The jungle is a nightmare in earlygame. It becomes an even bigger hassle when you enter hardmode. I would avoid it until you've beaten the Corruption or Crimson-specific early bosses at the minimum.
- To my knowledge, the Corruption and Crimson are pretty much equal loot-wise. but I always pick the Corruption because the Crimson has spiders and it's scary :(
- Get wings as soon as you can!!! Wings and flying mounts are incredible and will help you SO MUCH with maneuverability.
- Pretty mid-game suggestion, but the INSTANT you can, make a Minishark. It really helped me beat the first few hardmode bosses.
- Hardmode can be overwhelming, and it likes to drop bosses and raids on your lap out of nowhere. Take breaks if you need to, and focus on getting armor and equipment upgrades. You'll have the choice of deciding what sort of fighting style you like most, and I would recommend trying out all of them
(altho no one really has anything good to say about mostly using Familiars lol)
I absolutely love Terraria and think it's one of the best RPGs out there, and I hope you like it too!! :D