Build your gem mines, participate in events and tournaments, fight Clan Boss.

Those give you gems and in the case of tournaments and events they sometimes also give you energy refills. On the other games you mention, the gem like currency are only given for a clear of those stages ONCE, after you clear all of the maps you usually can't get anymore of the gem like currency from those levels.

Personally I strongly recommend for you to build the gem mines for infinite gem bonus.

Honestly, I never have issues with energy, in fact sometimes I struggle to spend all of my energies.

Hi, I feel your frustration, but here are some quick tips:

1. Complete your daily / weekly / monthly quests. Daily has seven (7) in total, and I think for the Classic Arena (5 fights) you can get more energy.
2. Also note that you get a daily refill for playing for 60 minutes. Accumulate this throughout the day, you don't have to do it in one stint (this way, your energy refills while away).
3. Level up, as you get more energy the higher your level.
4. If you get frustrated, try doing some Missions & Challenges. This will guide you in some way.
5. Focus on your starter Champion, if you don't have good pulls with shards, and try to level this champion to six star. This will open the gameplay a tad.
   
6. Check out some YouTube Videos, there are quite a few content creators out there.
7. Learn which champions are worth keeping, and which is "food" and how to "farm for food."
8. Look at Tournaments and Shard Boosted Days.

Hope these help at the start! I am also in the learning process, only recently took my starter Champion (Galek) to six-star.

Yes i underestand what you tell me

Im doing all of this but if i have at the end of the day 400 of energy 

I spend on a map that use 6 energy for lvling monters because i cant do it on brutal need my first 6* 

And i puting all my gems on the mine already have it lvl 2 i have only 7 days at the game but i want on my holydays to hard playing and cant because of the energy :(

If push comes to shove, you can goto the shop and buy full energy for 40gems.

Just know that gems are a great commodity to have in the game, so limit this where you can.

All the best, good hunting! 

Another hint which took me a while to notice is the log-in screen. Keep an eye out if the XP-flag is highlighted or not.

This can help greatly if you want to level up food or champions fast -  The amount of XP your Champions earn in Batlle is increased by 100%

You can buy an XP Boost in the SHOP if you want to (1 or 3 days), but take note when you activate these when available when playing, as its valid for 24 hours. As I said before, gems can be valuable in the game.

I love playing the game several hours a day.  I went from F2P to minnow.  There is a popup window that offers 900 gems for $19.99.  I buy that twice a month.  Its a better deal than anything in the shop.  There is also a popup for 5500 gems for $99.99 but I dont want to spend that kind of money.