@0hio when you say you want something informative with good ideas? What do you mean. Sounds like you have Pinterest which is the best for that.
But yes instagram is good. It's just photos and some videos you can search using # - so maybe #DIYharrypottercake and anyone who has tagged their pic or video with that would come up. Of course you can post a picture of a bin and tag it with the above and it will still come up.
I use it for home inspo, so recently I searched #babygirlnursery #ikeahacknursery #greenlivingroom etc to get idea of how people decorated their nurseries etc. Could then follow the accounts I like the most.
I also watch a shocking amount of cat videos on there.
It's only bad for your mental health if you don't realise that people lie. Ie some home instagrammers/influencers have these huge expensive houses, seem not to work, and have perfect lives. And that can be hard to compare your own life to, if you don't realise that the pictures are set up and curated to look perfect. Rest of the house is probably a tip and the kids are running amok but by god does that mantle piece look attractive with the antique candles (#gifted) and popular archway mirror.
Just like magazines are bad for mental health if you don't realise ever picture is edited to an inch of its life.
If you're an adult of basic intelligence Instagram is safe and easy to use