When playing as scout, avoid the open ground like the plague (of course, use your better judgement to know when you need to move such as when you get spotted, when your position is beginning to get pushed, when you spot an opportunistic target, or when you see that you're no longer contributing to the fight by spotting etc). Always try to move between bushes and abuse ridgelines.
Learn locations of bushes away from the main flanks where firefights break out, but with a good view of where enemy tanks can be expected to drive across. As such, a camo net and binocs are mandatory (and nice since those two can be demounted and remounted for free). Crew skills are all camo then retrain to sixth, grab anything improving mobility, and keep your camo crew up. A spotted light tank doesn't always have the luxury of an immediate escape route, so at such times you're down to luck and every bit of mobility you can afford.
I'll also throw in a couple bush spots /tactics that work for me in my light tanks. Of course, as always remember to apply your own judgement, ie if there are tons of other light tanks or fast high tier meds (ie t-54's) then don't take certain riskier positions.
Malinovka
At the beginning from either side I like to rush my light tanks to that center bush near the field. If one sticks under the ridgeline you can afford to rush there safely most of the time without getting spotted by td's who have yet to get to the ridge north of the lake. With the current meta being to apparently rush down south now, I find this tactic works better as most lights and meds like to suicide south now instead. However, if you get caught out here by say an enemy light you'll have no support from your allies.
As for the 3 bush spots above the field, if field is not viable you can still spot td's from both sides across the lake as they fire. The northern hill and field between are prone to suiscouts so watch out for getting spotted there. You'll want to pull back or become td fodder if that happens.
Prokhorovka
If you spawn from the north, you're one goal should be to poke over that midridge and spot the tanks leaving the spawn (if you're fast enough and get to the bushes to set up binocs at the start), and just keep making runs popping up to attempt to spot the td's from the west. The image is from an older version of the map, but now there are bushes and rocks littering the mid ridge for you to abuse. From the south however, the second circle to the left of the midridge is now a giant dip, which can be abused more favorably by meds with depression, but can work as a valid spot for lights to poke from as well.
Another note, be wary of the fight on the left side of the tracks near the midridge (now covered in rocks), if it gets overwhelmed then your position in mid will be in trouble as you're in the wide open field, hopefully though spotting them for your
useless fucktard camping td's in the back near A,-1.
Arctic Region
From the north spawn, if you want to play it safe then rush to around C5 and hide in those bushes (there's a forward and rear set of bushes that are both viable, but the forward one is usually safe to get too and provides better spots due to the closer distance). With camo and binocs you'll be able to spot tanks that try to engage from the E3 and cliff at F4/5.
In fast lights, with a bit of risky play from the north you can actually rush down into the field north of the southern hill pass and sit at those bushes in F7. from which you can grab spots on the south before they reach the hill, and once again spot the snipers at F4/5.
From the south spawn however I'm not too experienced. I've had mixed success rushing to B1 and B2 and working the small ridge there, but you have limited shots and effectiveness there depending on how aggressive the enemy is. If they push down the B5 hill to engage in the B3/4 area then you can work wonders, otherwise you'll have no shots. A valid tactic as the game develops is to rush the south field once again north of the hill, but take care as you can be spotted from the td's set up on the north line. Penetrating their flanks through there can be devastating once you get to the E9 area, where you're relatively safe from northern td's and can shoot down on the rears of the enemy tanks at the base of the hill road (unless they've pushed up too far already).
Mines
A forward note, I personally don't recommend rushing the hill in your lights unless you're a platoon of 3 or only 1 tier down (ie don't waste your time rushing up there in a m5 stuart in a tier 8 match). Fast meds like cromwells and tier 10 russian meds for example will tear you a new one should you go there alone.
In the case that you can successfully get up there and live, if you're from the north, then try to light the td's from the bushes facing the south, then proceed to light and harass the east flank pushing into the town. Attacking from the south, you want to sit in the D5 bushes and try to light the td's sitting at A4/5. Just watch out for getting proximity spotted by the north flank, as they tend to hug the cliff edge when fighting the east for town.
Always be on watch for the hill being overrun though, should you notice it fall you can retreat by driving down the cliff edges to safety.
Should you not be able to make it to the hill, then from north it's advisable to rush into position at the bushes in F3. With binocs you can spot all the arty and td's that like to drive and set up west to the K line. You're very prone to being spotted here though if you fire so resist the urge as it's a wide open area if you get spotted. From the south, if you rush to the bush at G3, you can get spots at anyone from the north poking the bushes on the west island.
Note that both rushes to either bush are able to spot eachother, that is if you catch the other light rushing for the other bush, you're gonna have a firefight in that big open pond.
And of course, these work for me most of the time, but as the battles unfold there are some general things to keep in mind as a light.
Mid to late game is a dangerous time for you to get spotted if your team is losing. Your main two priorities are spotting enemies and staying alive. The second is harassment after being very careful that you either won't be spotted or that you can get away. These shots of opportunity are far more important no matter how seemingly small the damage output late game where every little bit matters. Also, as much as it hurts, you're going to have to help your team as a light, and rely on them. Try to keep as many enemies lit as possible without being seen, and don't ever be afraid to run.
One last tip, never support your allies from the same area. Always try to watch over them from a different angle or a safe distance, as then the enemy will either turn to engage you (where you can run), or will get wittled down by you, both outcomes are favorable for you.
Feel free to dispute these tactics with me, if it'll help improve my game then I'd love to hear it.