Doing arenas can get you some 5* shards if you rank high enough. Complete and explore monthly quests. Get in a good alliance that gets 5* shards from wars and Summoner Advancement. The current monthly calendar also is giving 5* shards but this doesn't happen every month.
Check on YouTube as well. There are many videos and guides that will help you. You sound like a new player though, so if I were you I wouldn't worry too much about getting 5* shards as yet. Just focus on building up your roster and upgrading your existing champs as much as you can.
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Check on YouTube as well. There are many videos and guides that will help you. You sound like a new player though, so if I were you I wouldn't worry too much about getting 5* shards as yet. Just focus on building up your roster and upgrading your existing champs as much as you can.