As long as you dont hike to Trolltunga in jeans and sneakers you're fine.

Should check out Ætte-stupet

Did western Norway in 2019, hiked Preikestolen and Trolltunga (too burned out afterwards to handle Kjeragbolten in such a short timespan) but I can’t recommend them all enough. Actually trained a bit for Trolltunga as it’s an aggressive hike that subjects you to all types of weather (and got to the trailhead SUPER early as it gets quite busy). The Flam railway is quite nice if you want a break from hiking although Flam itself felt a little offputting once we saw all the massive cruise ships. Odda was a fun little base before the Trolltunga hike, definitely gave off the small Norwegian town vibe, and Stavanger felt very progressive with lots of cultural opportunities. Stayed in Forsand as a base for Kjerag & Preikestolen, which was tiny but beautiful. Just a gorgeous country from all we saw, would like to head north to Lofoten next time!

I am by no means an expert, but the area around Lysefjorden offers many opportunities for great hikes. Preikestolen, Kjerag, Sollifjellet to name just a few. Hardangervidda is really beautiful as well, you can walk up to Glaciers and lots of interesting places. My next trip will be to Jotunheimen, I can’t wait to experience the area. In general, Norway is wild and many hikes are quite demanding, and the weather in the mountains can change quickly, so be prepared and bring appropriate clothing (definitely bring raingear).