You need also unique password to some wallet to also avoid hacking.
Check all site that you are logging in because there are some fake sites.
I use my computer for online access, I once found my computer was attacked by viruses and trojans, which is my antivirus report, the file is dangerous because it will steal my financial accounts. So the minimum I always open or use bitcoins for transactions through desktop computer that has been installed antivirus updates, because I do not really believe access via mobile phone based on the problem of this virus as well.