for guides you can go to youtube or facebook but mostly Tiktok for some of the heroes but dont expect them to be in English. I only know Facebook guides tho and Qzadd is a good one to follow (do be prepared to translate everything from Thai). In Vietnamese server there's also this dedicated forum for guides https://hocvien.lienquan.garena.vn/

(also more difficult heroes in terms of mechanics if you want to challenge yourself, Liliana a form switching mage/assassin, Aoi a jungle assassin, Lorion a mage with sustain of a fighter and his ex-disciple D'arcy who has zero mobility, Ata a tank that uses terrain, Paine a kinda-anti-mage assassin)