So I might get a PS4 sometime soon, and my question is simple. Do I need to have a Playstation plus membership to play online? (like xbox live) I was looking somewhere and it said Playstation plus gives you extra things, but it didn't say if you need a membership to play online and whatnow.

Yes, Playstation Plus is required for the majority of online play.

There are a handful of games that are exempt from needing Playstation Plus (these are usually free-to-play games with their own servers, like TERA). But, unlike the PS3/Vita, you do need Playstation Plus to play multiplayer on the vast majority of games (practically all that have a physical copy).

I didn't know this sort of annoyed it used to be unecessary now I gotta subscribe bleh

You are required to have PS+ to play PS4 games online (except for Free to play games). They have discounts and free games (monthly) for PS+ members but most of the time they are useless. The only things i found worth buying from the PS store are some of the games they have during their $5 flash sale. The games on PS store are cut throat in comparison to the in store. $40-$48 in store vs $60 on PS store!. Digital only games will stay full price for 1-2 year later!!. of which you can find install for $20 or less. They will have a monopoly on pricing when all games going digital . I think a $40-$60 game 1-2 year after release will be the new normal then.

They will have FREE to play online weekend every now and then They probably think it's some special event.. .

Not worth it imo
But I need it to play online

I don't play online much. I just take advantage of the free days offered for PS Plus and that's about it.

Nowdays, i don't play online too much, mainly because i don't have enough time expect for the weekends. Still, it's great to have PS+ just to get discounts for digital games (i'm really not interested about that), to back up your save files to cloud and so on.

I got all the offline trophies for TLOU remastered today, i was thinking of getting the online trophies next to get the platinum...

They are offering 2 days free trial when you can get a 14 days trial here ?
https://store.playstation.com/#!/en-us/reward_game/ps-plus-14-day-trial/cid=IP9101-NPIA90005_01-PSPLUS14DAYTRIAL

Yes, most of the time