These days it's a bit better though since most things tend to be at the very least adequate to things you want to do and some things are just not touched for a long time, for example my Saryn build has not changed since they overhauled her however many years ago. Weapon builds and meta have somewhat changed with Kuva and Tenet weapons and also Steel Path mods and while I can't exactly say that looking shit up doesn't help the vast majority of things are still gonna end up with whoever you just went against having to shampoo all their carpets while you didn't get a scratch on you.
If you ever had the hand full of basic important mods at any point since Derelict Vaults you'll still be fine. Railjack you can just ride bitch in a turret for a few missions until you get the drops and the shit to build them. For everything else you can hit up
https://overframe.gg/ and get the basic idea. Also you can now just get the Oxylus pack for like 50 plat,
do whatever with the sentinel, keep the Verglas which is a death ray that floats just above your shoulder in any sentinel when modded right that can and has for me carried up to mid tier missions and pulled its weight in everything the game has to offer.