because your phone only has 2Gb of RAM, I don't recommend you to install many apps which tend to work in the background, for example, AVs
consider the posts from others, there are some nice apps
I assume you don't root your phone
- try not to install apps from outside playstore
- download bitdefender and perform a scan every 1-2 months, then uninstall it
- I recommend: Naked browser (free): it has an adblocker, which supports EasyList format -> you can add whatever you want to that list to strengthen adblocking, popups, malwares,... the downside is that it doesn't support element hiding you should add: EasyList without element hiding rules
this is the instruction how to add the blocklist to your phone:
naked browser resource blocking
the app is minimal, much faster and consumes less RAM than the resource-hog google chrome. Playing a video on chrome is laggy but not laggy in naked browser
EDIT:
Also something for ads on youtube?
there is no way to block ads on youtube in the official youtube app without root, they fixed it
perhaps, adguard can but using VPN sucks a lot of battery
only rooted phone with xposed can
personally, I use videoder (a youtube alternative) or play videos in your browsers with adblocker