What is an easy way to convert wav files to Flac?


I know this topic has been covered, but was wondering if there is an updated, and easy to use process. I had an old Qsonix server, on which I stored most of my music as wav files, due to the improved playback quality. I transferred files to my NAS, before my Qsonix drive died.
I am now using Roon, and it has not recognized, or imported my wav files from NAS to new streamer/server...all the Flac files and DSD files came over fine.
I do not possess strong computer skills; can someone suggest a relatively straightforward process to allow me to access my Wav files on NAs, in import to Innuos server as Flac, for playback via Roon? Is it possible to restore meta data, to recognize artist and track name, or organize the various tracks of an album onto an album?
Thanks
mribob
Also, I believe Exact Copy will convert for you.  A lifetime license is about $7 and it makes an exact WAV or FLAC file from your CD.   I haven't used it to convert one format to another but you might give it a try.   
Thanks for the responses....I understand if I rip a CD onto my server, and select wav. format, Roon will see and recognize. It doesn't see compartmented kernel stores on NAS in wav format...I need to click on the subgroup on the NAS, the wav files are all there, of course without metadata. I need to extract these files from sub file on NAS, and convert them to Flac. Then import from NAS to new server HD. I found on the web  promising options:
videosolo video converter ultimate, and Switch audio file converter software..
Also Convertio...just not sure how to download and access this on files in subfolders on NAS....which is where my old age, and lack of computer skills is requesting some guidance.
Try freac.org - free and easy to uses converter.  You can use it as batch converter.  I use it to convert ALAC to AAC (for phone and car).
Related question - I originally copied CDs to WAV files in iTunes and want to migrate the files to Roon Nucleus (I bought an SSD drive). Should I convert to Flac or just copy WATV files? Worried the track and meta data will be goofy with the WATV files.
Let me ask a basic question:
If I am able to convert my wav. files, to Flac, will there be associated meta deta, to allow me to organize files into tracks and albums associated with the original CD? If not, then no real point to go thru the conversion process. My wav. files on NAS have no meta data, just stored as digital encoded files in random order.
Thanks