Need help with all specs

Hi title is as literal as it gets

I’ve been playing wow for a bit now starting in wrath and with midnight being so easy to get alts levelled and geared I’ve decided to task my self on doing M+ on every spec in the game and make a mini series out of it on YouTube

Some I’ve played before and some I’ve never touched so if anyone’s got any niche or not so niche tips of any spec that you guys play it would be greatly appreciated to help me getting to grips with everyone

Thanks <3