Hi I'm relatively new to home brewing also so here's my experience over 6 brews so far,
I have zero temp control other than where I place fermentation bucket and have hard water.
So far I've had 3x brews at approx 24°+ and 3 below 20° and of all 6 my first1 was the 1 that tasted most home brewy, took approx 6weeks for that taste to mellow out but was still getting the odd bottle with that taste(stored slightly different, fridge Vs garage, garage1s being better).
Next 3 kits Cooper's kits, which seem to be really hopped, Ringwood I think? I'm still on the fence about weather I like it or not? Initial thought I either had an infection or there was some thing coming though from tape water, used bottle on next1 (same bitter back end) not the water then, next tried tap water Campden tablet and swapped out the yeast for us-05(same bitter back end) I was thinking use a yeast with wide temp spread and see if that had any bearings on taste.
The last 2 brews have come out very good, tap water campden tablet, muntons coffee porter and my first all grain 4ltr kit.
So what I think I've learnt from all I've read and experienced so far,
1Clean everything you use before n after Use, minimise contact with your brew once you've pitched the yeast.
2Temp control is important and if you can't control it, then select yeast for your expected temp, so far I've found Cooper's yeast pretty robust with a wide temp range
3Coopers kits use Ringwood hops(not to everyone's liking) I'm still buying them tho
4use a campden table with you tap water brews, not sure from personal experience if it has helped but for the cost of a tablet don't think it's worth the risk of not use1 based on what I've read.
5 I can see this hobby getting expensive if I let myself get carried away down the all grain route