Dear, never depend on tools and indicators totally because sometimes they can also generate a wrong signal which can destroy your trade which as a result you have to bear a loss i have seen indicators generating wrong signals like what indicators are suggesting to the traders the thing happens after it is totally inverse.
One Indicator you can use for buying and selling is RSI (Relative Strength Index) which gives you the best opportunity of buying and selling if it is lower than 30 it means it is a good time to buy and if it is higher than 70 it means it is not a good time of buying. DYOR